ES2908943T3 - Transmission of the sounding reference signal in low latency wireless transmissions - Google Patents

Abstract

A method (2100) for wireless communication, comprising: identifying (2105) a set of shortened transmission time intervals, sTTI (615, 620, 625, 630, 635, 640), for the uplink transmissions of a first wireless service, the set of sTTIs (615, 620, 625, 630, 635, 640) are located within the subframe time limits of a subframe (600) of a second wireless service; identify (2110) two or more sTTIs (615, 640) within the set of sTTIs (615, 620, 625, 630, 635, 640) for the transmission of the sounding reference signal, SRS, transmissions within the subframe time limits; and transmitting (2125) one or more SRS transmissions in at least one of the two or more sTTIs (615, 640), the method further comprising identifying (2115) a first subset (620, 625, 630, 635) of the set of sTTI each spanning two orthogonal frequency division multiplexing, OFDM, symbols, and a second subset (615, 640) of the set of sTTI each spanning three OFDM symbols; and configuring (2120) two or more sTTIs of the second subset (615, 640) for the one or more SRS transmissions, wherein identifying (2115) the second subset comprises: identifying a first three-symbol sTTI (615) as a initial sTTI of a first slot within the time limits of the subframe; identifying a second three-symbol sTTI (640) as a final sTTI of a second slot within the time limits of the subframe; and identifying a first SRS symbol (645-a) within the first three-symbol sTTI (615) for a first SRS transmission and a second SRS symbol (645-b) within the second three-symbol sTTI (640 ) for a second SRS transmission, wherein the second SRS symbol (645-b) of a first subframe (600) is adjacent to the first SRS symbol of a subsequent subframe.

Description

DESCRIPTION

Transmission of the polling reference signal in low latency wireless transmissions

Background

The following refers generally to wireless communication, and more specifically to the transmission of the sounding reference signal in low latency wireless transmissions.

Multiple access wireless technologies have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example of a telecommunications standard is Long Term Evolution (LTE). LTE is designed to improve spectrum efficiency, lower costs, improve services, make use of new spectrum, and better integrate with other open standards. LTE can use OFDMA in the downlink (DL), single carrier frequency division multiple access (SC-FDMA) in the uplink (UL), and multiple input multiple output (MIMO) antenna technology.

In some examples, a multiple access wireless communication system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, otherwise known as user equipment (UEs). In an LTE or LTE-Advanced (LTE-A) network, a set of one or more base stations can define an eNodeB (eNB). In other examples ( for example, in a next generation new radio (NR) or 5G network), a multiple access wireless communication system may include a number of intelligent radio heads (RH) in communication with a number of controllers. access node (ANC), where a set of one or more RHs, in communication with an ANC, define a base station (eg, an eNB or gNB). A base station can communicate with a set of UEs on downlink (DL) channels (for example, for transmissions from a base station to a UE) and uplink (UL) channels (for example, for transmissions from a base station). a UE to a base station).

A base station in some LTE or NR deployments may transmit to one or more UEs by using different length transmission time intervals (TTIs) that may be reduced in length relative to the legacy LTE TTIs. Such a reduced length TTI may be referred to as a shortened TTI (sTTI) and the users that communicate using the sTTIs may be referred to as low latency users. An sTTI may be a subset of one or more subframes that correspond to legacy TTI subframes. A base station may allocate transmission resources for sTTIs to a UE which may include time resources, frequency resources, and one or more component carriers (CCs) to be used for sTTI transmissions. Efficient allocation of such resources for data transmissions, control information, and reference signals can help increase the efficiency of a wireless communications system.

3GPP Draft R1-166862 "Discussion on UL design for shortened TTI" suggests supporting a transmission duration based on a 2-symbol sTTI, a 4-symbol sTTI, and a 1-slot sTTI for a sPUCCH/sPUSCH.

EP 2538738 A1 suggests the efficient use of radio resources that are used in SRS transmission. A base station apparatus (eNodeB) transmits a scheduling grant including an instruction to transmit a polling reference signal (SRS), and a mobile station apparatus (UE) transmits the SRS in response to the scheduling grant .

3GPP draft R1-162581 "SRS enhancements for latency reduction" suggests allowing frequent transmission of SRS for high mobility or changing density in the frequency domain.

US 2013/265 977 A1 provides a method and apparatus for transmitting an aperiodic sounding reference signal (SRS) in a wireless communication system.

Summary

The invention is defined in the independent claims. In the following, the parts of the description and drawings that refer to embodiments that are not covered by the claims are not presented as embodiments of the invention but as background art or examples useful for understanding the invention. The techniques described in relation to improved procedures, systems, devices, or apparatus that support sounding reference signal (SRS) transmission in low-latency wireless transmissions. Generally, the described techniques provide for the identification of a set of shortened transmission time intervals (sTTI) for the uplink transmissions of a first wireless service (eg, an ultra reliable low latency communication (URLLC) service); the set of sTTIs that fall within the time limits of the subframe of a subframe of a second wireless service (eg, an enhanced mobile broadband (eMBB) service). Two or more sTTIs within the set of sTTIs may be used for SRS transmissions within subframe time limits. In some examples, subframe time boundaries may include two slot boundaries (for example, 0.5 ms slot boundaries within a 1 ms subframe), and sTTIs may be sTTIs that are slot-aligned such that the sTTI do not span the slot boundaries. An sTTI may have a length corresponding to a slot length in some examples. In other examples, multiple sTTIs may be located within each slot, with each sTTI being two or three orthogonal frequency division multiplexing (OFDM) symbols long.

In some cases, one OFDM symbol from each slot can be identified for SRS transmissions. In some examples, each slot may include two 2-symbol sTTIs and one 3-symbol sTTI, and one OFDM symbol from each 3-symbol sTTI may be selected for SRS transmissions. In some examples, two or more symbols of two or more 2-symbol sTTIs may be selected for SRS transmissions. The SRS transmissions may be configured, in some examples, as aperiodic SRS transmissions or periodic SRS transmissions. In some cases, a bandwidth used for SRS transmissions may be selected to provide frequency diversity for channel estimation. Also, in some cases, SRS transmissions may be multiplexed with other transmissions, such as demodulation reference signal (DMRS) transmissions or SRS transmissions from other transmitters.

A wireless communication method is described. The method includes identifying a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs located within the subframe time boundaries of a subframe of a second wireless service, identifying two or more sTTIs within of the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe, and transmit one or more SRS transmissions in at least one of the two or more sTTIs.

An apparatus for wireless communication is disclosed. The apparatus includes means for identifying a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs located within subframe time boundaries of a subframe of a second wireless service, means for identifying two or more sTTIs within the set of sTTIs for transmitting the SRS transmissions within the time limits of the subframe, and means for transmitting one or more SRS transmissions in at least one of the two or more sTTIs.

Another apparatus for wireless communication is disclosed. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be operated, when executed by the processor, to cause the apparatus to identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs being located within the time limits of the subframe of a subframe of a second wireless service, identify two or more sTTIs within the set of sTTIs for the transmission of SRS transmissions within the time limits of the subframe, and transmit one or more SRS transmissions in at least one of the two or more sTTIs.

A non-transient computer readable medium for wireless communication is disclosed. The non-transient computer-readable medium may include operable instructions, for causing the processor to identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs being located within the time limits of the subframe of a subframe of a second wireless service, identify two or more sTTIs within the set of sTTIs for the transmission of SRS transmissions within the time limits of the subframe, and transmit one or more SRS transmissions in at least one of the two or more sTTIs.

In some examples of the method, apparatus, and non-transient computer-readable medium described above, a number of transmissions of s Rs within subframe time limits may be configured by a base station.

The method, apparatus, and non-transient computer-readable medium described above further include processes, features, means, or instructions for identifying a first subset of the set of sTTIs each encompassing two OFDM symbols and a second subset of the set of sTTIs each. one encompassing three OFDM symbols. The method, apparatus, and non-transient computer-readable medium described above further includes processes, features, means, or instructions for configuring two or more sTTIs of the second subset for the one or more SRS transmissions.

In accordance with the method, apparatus and non-transient computer-readable medium described above, identifying the second subset comprises identifying a first three symbol sTTI as an initial sTTI of a first slot within subframe time limits, identify a second three-symbol sTTI as a final sTTI of a second slot within subframe time limits, and identify a first SRS symbol within the first three-symbol sTTI for a first SRS transmission and a second symbol within the second three-symbol sTTI for a second SRS transmission, wherein the second SRS symbol of a first subframe is adjacent to the first SRS symbol of a subsequent subframe. Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for selecting a first frequency band for the first SRS transmission. Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for selecting a second frequency band for the second SRS transmission that may be different from the first frequency band, wherein the first frequency band and the second frequency band may be selected to provide frequency diversity between the first SRS transmission and the second SRS transmission. In some examples of the method, apparatus, and non-transient computer-readable medium described above, the locations of the first SRS symbol and the second SRS symbol may be selected to provide a reduced transient time for a change in one or more of an uplink transmit power or resource block allocation associated with the first SRS transmission and the second SRS transmission.

In some examples of the method, apparatus, and non-transient computer-readable medium described above, identifying the second subset comprises identifying a final sTTI within each of a first slot and a second slot within time limits of the subframe as the three-symbol sTTI. In some examples of the method, apparatus and non-transient computer-readable medium described above, an SRS symbol location within each sTTI of the second subset may be selected to provide time diversity between subsequent SRS transmissions and in which frequency bands for subsequent SRS transmissions may be selected to provide frequency diversity between subsequent SRS transmissions.

Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for selecting the symbol location of the SRS within the first slot to be either an initial symbol or a last symbol of the associated three-symbol sTTI. Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for selecting the SRS symbol location within the second slot to be the last symbol of the sTTI. three associated symbols.

In some examples of the method, apparatus, and non-transient computer-readable medium described above, the two or more two-symbol sTTIs within each of a first slot and a second slot within subframe time limits may be configured for SRS transmissions. In some examples of the method, apparatus, and non-transient computer-readable medium described above, one or both OFDM symbols within the two or more sTTIs may be configured for SRS transmissions.

Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for receiving an aperiodic configuration in an uplink grant indicating the resources for the one or more SRS transmissions. in at least one of the two or more sTTIs. Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for receiving a downlink grant indicating that an uplink control channel transmission is to be transmitted. Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for determining, based, at least in part, on the downlink grant, that the one or more transmissions of SRS must be transmitted. In some examples of the method, apparatus, and non-transient computer-readable medium described above, the determination may be based, at least in part, on an indication that data and a DMRS should be transmitted in two symbols of a three-symbol sTTI .

In some examples of the method, apparatus, and non-transient computer-readable medium described above, the one or more sRs transmissions may be used as payload in one or more sTTIs that do not otherwise contain the uplink transmissions.

Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for receiving configuration information indicating resources for periodic SRS transmissions. In some examples of the method, apparatus and non-transient computer-readable medium described above, the configuration information comprises an indication of the cell-specific sTTIs and the UE-specific sTTIs to be used for SRS transmissions, and in wherein the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for identifying a first sTTI for SRS transmission where the first sTTI corresponds to both a cell-specific sTTI and to a UE-specific sTTI.

Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for identifying a first bandwidth for the one or more SRS transmissions that are based at least in part on one or more of a channel bandwidth or sTTI length for uplink transmissions. In some examples of the method, apparatus, and non-transient computer-readable medium described above, the first bandwidth for a first SRS transmission may be increased relative to a second bandwidth for one or more SRS transmissions associated with the second wireless service.

Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for multiplexing a DMRS with a first SRS into a first symbol that may be configured for both the DMRS and the transmission. of SRS. In some examples of the method, apparatus and non-transient computer-readable medium described above, the multiplexing comprises transmitting the DMRS in a first symbol interleave and transmitting the first SRS in a second first symbol interleave. In some examples of the method, apparatus, and non-transient computer-readable medium described above, multiplexing comprises transmitting the DMRS in a first interleave of the first symbol using a first cyclic shift, and transmitting the first SRS in the first interleave. of the first symbol by using a second cyclic shift. In some examples of the method, apparatus, and non-transient computer-readable medium described above, the multiplexing comprises transmitting the DMRS using a first cyclic shift and transmitting the first SRS using a second cyclic shift. In some examples of the method, apparatus, and non-transient computer-readable medium described above, multiplexing comprises transmitting the DMRS using a first set of antenna ports and transmitting the first SRS using a second set of antenna ports. antenna ports that can be different than the first set of antenna ports.

A wireless communication method is described. The method includes identifying a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs located within the subframe time boundaries of a subframe of a second wireless service, identifying two or more sTTIs within of the set of sTTIs for transmitting the SRS transmissions within the time limits of the subframe, and configuring a UE to transmit one or more SRS transmissions in at least one of the two or more sTTIs.

An apparatus for wireless communication is disclosed. The apparatus includes means for identifying a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs located within subframe time boundaries of a subframe of a second wireless service, means for identifying two or more sTTIs within the set of sTTIs for transmitting the SRS transmissions within subframe time limits, and means for configuring a UE to transmit one or more SRS transmissions in at least one of the two or more sTTIs .

Another apparatus for wireless communication is disclosed. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions may be operated, when executed by the processor, to cause the apparatus to identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs being located within the time limits of the subframe of a subframe of a second wireless service, identify two or more sTTIs within the set of sTTIs for transmission of SRS transmissions within the time limits of the subframe, and configure a UE to transmit one or more SRS transmissions in at least one of the two or more sTTI.

A non-transient computer readable medium for wireless communication is disclosed. The non-transient computer-readable medium may include instructions operable to cause a processor to identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within the time limits of the subframe of a subframe of a second wireless service, identify two or more sTTIs within the set of sTTIs for transmission of SRS transmissions within the time limits of the subframe, and configure a UE to transmit one or more SRS transmissions in at least one of the two or more sTTI.

The method, apparatus, and non-transient computer-readable medium described above further include processes, features, means, or instructions for configuring a first subset of the set of sTTIs each encompassing two OFDM symbols and a second subset of the set of sTTIs each. one encompassing three OFDM symbols. Some examples of the method, apparatus, and non-transient computer-readable medium described above further include processes, features, means, or instructions for configuring two or more sTTIs of the second subset for the one or more SRS transmissions.

In the method, apparatus, and non-transient computer-readable medium described above, configuring the second subset comprises configuring a first three-symbol sTTI as an initial sTTI of a first slot within subframe time limits, configuring a second sTTI of three sTTI symbols as a final sTTI of a second slot within subframe time limits, and configuring a first SRS symbol within the first three-symbol sTTI for a first SRS transmission and a second SRS symbol. the SRS within the second three-symbol sTTI for a second SRS transmission, wherein the second symbol of a first subframe is adjacent to the first symbol of a subsequent subframe. In some examples of the method, apparatus, and non-transient computer-readable medium described above, the locations of the first SRS symbol and the second SRS symbol may be selected to provide a reduced transient time for a change in one or more of a transmission power of uplink or resource block allocation associated with the first SRS transmission and the

second transmission of SRS.

In some examples of the method, the apparatus and non-transient computer-readable medium described

above, configuring the second subset comprises configuring a final sTTI within each of

a first slot and a second slot within the time limits of the subframe as the sTTI of three

symbols.

Some examples of the procedure, apparatus and non-transient computer readable medium described

above may also include processes, characteristics, means or instructions to identify a

subset of the set of sTTIs each spanning two OFDM symbols. Some examples of

The method, apparatus, and non-transient computer-readable medium described above further includes

processes, features, means, or instructions for configuring two or more sTTIs of the subset for the one or more

SRS transmissions. In some examples of the procedure, the apparatus and the computer-readable medium are not

transient described above, one or both OFDM symbols within the two or more sTTIs may

configured for SRS transmissions.

Some examples of the procedure, apparatus and non-transient computer readable medium described

above may also include processes, features, means or instructions for transmitting a

aperiodic configuration in an uplink grant to the UE indicating the resources for the one or more

SRS transmissions. Some examples of the procedure, apparatus, and computer-readable medium are not

transient described above may further include processes, features, means, or instructions for

transmit a downlink grant to the UE indicating that a broadcast channel transmission should be transmitted

uplink control and that the one or more SRS transmissions should be transmitted. In some examples of

procedure, apparatus, and non-transient computer-readable medium described above, determining

that the one or more SRS transmissions may be transmitted may be based, at least in part, on an indication

in the downlink grant that data and a DMRS must be transmitted in two symbols of a

sTTI of three symbols.

Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for transmitting the information.

configuration that indicates the resources for periodic SRS transmissions. In some examples of

procedure, apparatus, and non-transitory computer-readable medium described above, the

configuration comprises an indication of the cell-specific sTTIs and the UE-specific sTTIs that

they can be used for SRS transmissions, and a first sTTI for SRS transmission can identify when the first sTTI corresponds to both a cell-specific sTTI and a UE-specific sTTI.

Some examples of the method, apparatus, and non-transient computer-readable medium described above may further include processes, features, means, or instructions for identifying a first

bandwidth for a first SRS transmission of the one or more SRS transmissions that are based on the

least in part in one or more of a channel bandwidth or sTTI length for transmissions of

uplink.

Some examples of the non-transient method, apparatus, or computer-readable medium described above

they may further include processes, features, means, or instructions for configuring the UE to multiplex a

DMRS with a first SRS transmission on a first symbol. Some examples of the procedure, apparatus and

the non-transient computer-readable medium described above may further include processes,

features, means, or instructions for receiving the DMRS on a first symbol interleave and receiving the

first SRS transmission in a second interleave of the first symbol. Some examples of the procedure, the

non-transient computer-readable medium and apparatus described above may further include processes,

features, means, or instructions for receiving the DMRS on a first symbol interleave by

using a first cyclic shift and receiving the first SRS transmission on the first interleave of the

first symbol by using a second cyclic shift. Some examples of the procedure, the

non-transient computer-readable medium and apparatus described above may further include processes,

features, means or instructions to receive the DMRS by using a first cyclic shift and

receive the first SRS, by using a second cyclic shift. Some examples of the procedure,

the apparatus and non-transient computer-readable medium described above may further include processes,

characteristics, means or instructions to receive the DMRS by using a first set of ports of

antenna and receive the first SRS transmission by using a second set of antenna ports that

they may be different from the first set of antenna ports.

Brief description of the drawings

Figure 1 illustrates an example of a system for wireless communication that supports SRS transmission

in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 2 illustrates an example of a wireless communication system that supports SRS transmission in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 3 illustrates an example of slot-aligned sTTI resources supporting transmission of SRS in low-latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 4 illustrates an example of uplink resources within subframes that can support SRS transmission in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 5 illustrates another example of uplink resources within subframes that may support SRS transmission in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 6 illustrates an example of frequency bands in a subframe that may be selected for SRS transmissions in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 7 illustrates an example of wireless resources and transient times for SRS transmissions in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 8 illustrates another example of wireless resources and transient times for SRS transmissions in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 9 illustrates an example of frequency resources that can support SRS transmission in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 10 illustrates an example of reference signal multiplexing that supports transmission of SRS in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 11 illustrates an example of a process flow that supports the transmission of SRS in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figures 12 through 14 show block diagrams of a device that supports SRS transmission in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 15 illustrates a block diagram of a system including a UE that supports transmission of SRS in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figures 16 through 18 show block diagrams of a device that supports SRS transmission in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figure 19 illustrates a block diagram of a system including a base station that supports transmission of SRS in low latency wireless transmissions in accordance with aspects of the present disclosure.

Figures 20 through 36 illustrate methods for transmitting SRS in low latency wireless transmissions in accordance with aspects of the present disclosure.

Detailed description

Improved methods, systems, devices or apparatus of various examples can be used to support sounding reference signal (SRS) transmission for shortened transmission time interval (sTTI) communications in low latency wireless communication systems. Resources that are allocated for low latency communication can be used for both uplink and downlink communication through the use of sTTIs that are short in length relative to communication TTIs that can be relatively latency insensitive, such as Enhanced Mobile Broadband (eMBB) transmissions which can use a TTI duration of 1 ms. Communications using sTTIs may use, in some cases, an sTTI duration corresponding to one slot of a wireless subframe, or an sTTI duration corresponding to two or three orthogonal frequency division multiplexing (OFDM) symbols. In some cases, sTTIs can be configured to have boundaries within, or align with, the boundaries of a 1 ms TTI slot. In some examples, the sTTIs may span two or three OFDM symbols, and each slot may have three sTTIs. In such a way, all seven symbols in a slot can be used by using a normal cyclic prefix and system resources can be used more efficiently relative to a case where three two-symbol sTTIs would be included in a seven-symbol slot. symbols.

Various techniques, as disclosed herein, can provide uplink resource identification for sTTI transmissions. A portion of the uplink resources may be used for reference signal transmissions, such as SRS transmissions. In some examples, resources for a number of the sTTIs may be slotted into a subframe boundary that includes a number of the sTTIs, and two or more sTTIs may be configured for SRS transmissions. An sTTI may have a length corresponding to a slot length in some examples. In other examples, multiple sTTIs may be located within each slot, with each sTTI being two or three OFDM symbols long.

In some cases, one OFDM symbol from each slot can be identified for SRS transmissions. In some examples, each slot may include two 2-symbol sTTIs and one 3-symbol sTTI, and one OFDM symbol from each 3-symbol sTTI may be selected for SRS transmissions. In some examples, two or more symbols of two or more 2-symbol sTTIs may be selected for SRS transmissions. The SRS transmissions may be configured, in some examples, as aperiodic SRS transmissions or periodic SRS transmissions. In some cases, a bandwidth used for SRS transmissions may be selected to provide frequency diversity for channel estimation. Also, in some cases, SRS transmissions may be multiplexed with other transmissions, such as demodulation reference signal (DMRS) transmissions or SRS transmissions from other transmitters.

Low latency communications using sTTIs can be used in systems, for example, that can support multiple different services for data communications. Different services can be selected depending on the nature of the communications. For example, communications that require low latency and high reliability, sometimes referred to as mission critical communications (MiCr), may be served by a lower latency service ( for example, a URLLC service) that uses the sTTI. Consequently, communications that are more tolerant of delays may be served by a service that provides relatively higher throughput with slightly higher latency, such as a mobile broadband service (for example, an eMBB service). which uses the 1 ms TTIs. In other examples, communications may be with UEs that are embedded in other devices (eg , meters, vehicles, appliances, machinery, etc.), and a machine-type communication (MTC) service (eg, massive MTC (mMTC)) can be used for such communications. In some cases, different services (eg eMBB, URLLC, mMTC) may have different TTIs, different subcarrier (or pitch) spacings, and different cyclic prefixes.

This disclosure describes various techniques with reference to next-generation networks (for example, 5G or NR networks) that are designed to support features such as high-bandwidth operations, more dynamic subframe/slot types, and subframe/slot types. autonomous slots (in which hybrid auto-repeat request (HARQ) feedback for a subframe/slot may be transmitted before the end of the subframe/slot). However, such techniques can be used for any system where TTIs of different lengths can be transmitted in a wireless communication system.

Aspects of the disclosure are initially described in the context of a wireless communications system. Then various examples of SRS configurations for different sTTI resources are described. Aspects of the disclosure are further illustrated and described with reference to apparatus diagrams, system diagrams, and flow diagrams relating to reference signal pattern and pilot sharing for shortened transmission time interval wireless communications.

Figure 1 illustrates an example of a wireless communications system 100 in accordance with various aspects of the present disclosure. Wireless communications system 100 includes base stations 105, UEs 115, and a core network 130. In some examples, wireless communications system 100 may be an LTE (or LTE-Advanced) network, or New Radio (NR) network. ). In some cases, wireless communications system 100 may support enhanced broadband communications, ultra-reliability (ie, mission critical communications), low latency communications, and communications with low cost, low complexity devices. SRS transmissions associated with low latency communications may be transmitted from UEs 115 of wireless communications system 100 in accordance with techniques described herein.

Base stations 105 may communicate wirelessly with UEs 115 through one or more base station antennas. Each base station 105 may provide communication coverage for a respective geographic coverage area 110. Communication links 125 displayed in wireless communication system 100 may include uplink (UL) transmissions from a UE 115 to a base station 105, or downlink (DL) transmissions, from a base station 105 to a UE 115. Information and control data may be multiplexed into an uplink or downlink channel according to various techniques. Information and control data may be multiplexed onto a downlink channel, for example by using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques . In some examples, the control information that is transmitted during a TTI of a downlink channel may be distributed among different control regions in a cascaded manner (for example , between a common control region and one or more specific control regions). of the EU).

The UEs 115 may be dispersed throughout the wireless communications system 100 and each UE 115 may be stationary or mobile. A UE 115 may also be referred to as a mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communications device, remote device, mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a telephone, a user agent, a mobile client, a client, or some other suitable terminology. A UE 115 may also be a cell phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a tablet, a laptop computer, a cordless phone, a personal electronic device, a device laptop, personal computer, wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, machine type communication (MTC) device, home appliance, a car, a drone or the like.

In some cases, a UE 115 may also be able to communicate directly with other UEs (eg, by using a peer-to-peer (P2P) or device-to-device (D2D) protocol). Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices, and may provide automated communication between machines, ie Machine-to-Machine (M2M) communication. M2M or MTC can refer to data communication technologies that allow devices to communicate with each other or with a base station without human intervention. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business payload.

In some cases, an MTC device may operate using half-duplex (one-way) communications at a reduced peak rate. MTC devices can also be configured to enter a "deep sleep" power saving mode when not engaged in active communications. In some cases, MTC or IoT devices can be designed to support mission-critical functions, and the wireless communications system can be configured to provide ultra-reliable, low-latency communications for these functions.

Base stations 105 may communicate with core network 130 and with each other. For example, base stations 105 may interact with core network 130 via return links 132 (eg, S1, etc.). Base stations 105 may communicate with each other over return links 134 ( eg , X2, etc.) or directly or indirectly (eg, through core network 130). Base stations 105 may perform radio configuration and programming for communication with UEs 115, or may operate under the control of a base station controller (not shown). In some examples, base stations 105 may be macro cells, small cells, hot spots, or the like. Base stations 105 may be an example of an LTE eNB, an LTE eNB, a gNB NR, Node-B NR, an access node NR, and may include an access node controller (ANC).

A base station 105 may interact with the core network 130 via return links 132 (eg S1, S2, NG-1, NG-2, NG-3, NG-C, NG-U etc.) and may perform radio configuration and programming for communication with UEs 115 within an associated coverage area 110. In various examples, network devices 105-b may communicate, either directly or indirectly (for example, via the network 130), with each other over return links 134 (eg, X1, X2, Xn, etc.), which may be wired or wireless communication links. Each base station 105 may also communicate with a number of UEs 115 via a number of other network devices, where a network device may be an example of a transmit receive point (TRP), a distributed unit (DU) , a Radio Head (RH), a Remote Radio Head (RRH), or a Smart Radio Head.

Wireless communications system 100 may support operation on multiple cells or carriers, a feature that may be referred to as carrier aggregation (CA) or multi-carrier operation. A carrier may also be referred to as a component carrier (CC), a layer, a channel, etc. The terms "carrier", "component carrier", "cell" and "channel" may be used interchangeably herein. A UE 115 may be configured with multiple downlink CCs and one or more uplink CCs for carrier aggregation. Carrier aggregation can be used with both FDD and TDD component carriers.

In some cases, the wireless communications system 100 may use enhanced component carriers (eCC). An eCC can be characterized by one or more features including: wider bandwidth, shorter symbol duration, and shorter transmission time interval (TtI). In some cases, an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (eg, where multiple serving cells have a suboptimal or non-ideal return link). An eCC can also be configured for use in unlicensed spectrum or shared spectrum (where more than one operator is allowed to use the spectrum). In some cases, an eCC may use a different symbol duration than other CCs, which may include the use of a reduced symbol duration compared to other CCs. token durations of the other CCs. A shorter symbol duration is associated with a larger subcarrier separation. A device, such as a UE 115 or base station 105, using eCCs can transmit wideband signals (eg, 20, 40, 60, 80 MHz, etc.) at reduced symbol durations ( eg , 16 .67 microseconds). A TTI in an eCC may consist of one or multiple symbols. In some cases, the TTI duration (ie the number of symbols in a TTI) may be variable. A 5G or NR carrier can be considered an eCC.

In some cases, wireless system 100 may use both licensed and unlicensed bands of frequency spectrum. For example, wireless system 100 may employ LTE License Assisted Access (LTE-LAA) or LTE Unlicensed Radio Access (LTE U) technology or NR technology in an unlicensed band such as the industrial, scientific, and medical band ( ISM) of 5Ghz. When operating in unlicensed bands of the radio frequency spectrum, wireless devices such as base stations 105 and UEs 115 may employ listen-before-talk (LBT) procedures to ensure that the channel is cleared before transmitting data. In some cases, operations in unlicensed bands may be based on a carrier aggregation (CA) configuration in conjunction with component carriers (CC) operating in a licensed band. Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, or both. Unlicensed spectrum duplexing can be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.

Time slots in LTE or NR can be expressed in multiples of a basic time unit (which can be a sampling period of Ts = 1/30,720,000 seconds). Time resources in LTE/LTE-A can be organized according to radio frames of length 10 ms (Tf = 307,200 Ts), which can be identified by a system frame number (SFN) ranging from 0 to 1,023 . Each frame can include ten 1-ms subframes that are numbered 0 to 9. A subframe can be further divided into two 0.5-ms slots, each containing 6 or 7 modulation symbol periods (depending on the length of the cyclic prefix that precedes each symbol). Excluding the cyclical prefix, each symbol contains 2,048 sample periods. In some cases the subframe may be the smallest programming unit, also known as a TTI. In other cases, a TTI may be shorter than a subframe or may be dynamically selected (eg, in bursts of sTTIs or in component carriers that are selected using sTTIs). Various examples described herein provide techniques for shortened TTIs, which can provide SRS resources that can occur within two or more sTTIs in a subframe and can be used by a base station 105 to estimate the quality of the transmission channel. uplink associated with a UE 115 over a bandwidth that may be wider than a bandwidth used for uplink data transmission from the UE 115. In some cases, one or more OFDM symbols may be configured within the sTTI of each slot for SRS transmissions.

Figure 2 illustrates an example of a wireless communications system 200 for transmitting the sounding reference signal in low latency wireless transmissions. Wireless communications system 200 includes a base station 105-a and a UE 115-a, which may be examples of aspects of a UE 115 as described above with reference to the Figure. 1. In the example of Figure 2, the wireless communications system 200 may also operate in accordance with a radio access technology (RAT) such as a 5G or NR RAT, although the techniques described herein may be applied to any RAT and to systems that can simultaneously use two or more different RATs.

Base station 105-a may communicate with UE 115-a via carrier 205. In some examples, base station 105-a may allocate resources for communication with UEs via carrier 205. For example, the base station 105-a may allocate subframes 210 for communication with UE 115-a, and one or more subframes 210 may correspond to a legacy LTE TTI having a TTI length of one ms. In this example, subframes 210 may include a first subframe 210-a, a second subframe 210-b, and a third subframe 210-c. Each of the subframes 210 may include two slots, where each slot may have seven symbols for a normal cyclic prefix. In this example, a first slot (slot 0) 220 and a second slot (slot 1) 225 may be included in the first subframe 210-a.

As noted above, in the uplink of a low-latency system, different sTTI lengths may be used for transmissions over carrier 205. For example, the durations of two-symbol sTTI, three-symbol sTTI, and three-symbol sTTI. 1 slot can be supported for physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) transmissions (or shortened PUCCH (sPUCCH) and shortened PUSCH (sPUSCH) transmissions). Thus, within either the first slot 220 or the second slot 225, there may be multiple sTTIs, such as a first sTTI (TTI-0) 230, a second sTTI (TTI-1) 235, and a third sTTI (TTI-2). ) 240, which can each have a duration of two or three OFDM symbols.

When using a two-symbol or three-symbol sTTI, in some cases it may be desirable to have a fixed sTTI structure where the sTTI boundaries lie within the slot boundaries or align with the slot boundaries, such as the boundaries of the first slot 220 or the second slot 225, which may be referred to as the slot-aligned sTTIs. As described above, when using a normal CP, seven symbols are included in each slot 220-225, and therefore each slot can include three sTTIs for the sTTI that line up by slot. As the TTI length shortens, it may not always be possible to reuse legacy SRS resources for SRS transmissions from sTTI transmissions, since a particular sTTI may not include a legacy SRS resource. More specifically, in legacy LTE, an SRS may be transmitted via the last OFDM symbol within a valid SRS subframe, and may be used for uplink frequency selective scheduling and/or link timing estimation. uplink (especially when there are no Uplink Physical Shared Channel (PUSCH) or Uplink Physical Control Channel (PUCCH) transmissions for some time).

The SRS transmissions may be on the same, overlapping, or different frequency resources as the PUSCH transmissions from UE 115-a. Additionally, different types of the SRS are supported. More specifically, SRS type 0 can be activated by radio resource control (RRC) signalling, which can include a single SRS or a periodic SRS with periodicity intervals from 2 ms to 320 ms. Legacy SRS types also include SRS type 1, which are configured by the RRC, but triggered by the DL/UL DCI, and different SRS configuration sets are defined by the upper layer and may include , for example, SRS bandwidth, frequency domain position, transmission comb index, cyclic shift (CS), and the like. From a frequency domain resource selection perspective, SRS transmissions can be categorized as wideband SRS that occupy the entire bandwidth of interest (not necessarily all available bandwidth) or wideband SRS. which may be more suitable for users with poor coverage and allow UE 115s to do frequency hopping between SRS transmissions. The SRS resources may be configured by base station 105-a by providing a cell-specific SRS configuration that defines the subframes that may contain the SRS transmission, as well as the set of available SRS bandwidth. in the cell. Base station 105-a may also provide a UE-specific SRS configuration that defines time-domain and frequency-domain resources. The UE 115-a in such deployments may send an SRS if its UE-specific SRS subframe matches the cell-specific SRS subframe. The UE 115-a may also refrain from transmissions on the SRS resources of the cell-specific SRS subframe to avoid interference with the SRS transmissions of other UEs.

When operating using the sTTIs, the legacy SRS configurations may not provide enough SRS opportunities for the UE 115-a, since, for each 1 ms subframe, there is at most one transmission opportunity. MR. Under sTTI operation, given the finer timing allocation (shorter sTTI length), various aspects of the present disclosure provide multiple SRS transmission opportunities within a subframe. Such SRS transmissions can be beneficial, for example, because they provide an uplink adaptive link that can better follow channel variations over time, both in systems that rely on FDD and t Dd , which may be suitable for high-speed scenarios that can be supported by a URLLC service. Multiple SRS transmissions per subframe can also be beneficial in cases where the UE 115-a may have poor coverage and can be configured to transmit SRS over a relatively narrow frequency bandwidth with frequency hopping across multiple channels. SRS opportunities, by allowing faster channel estimation (eg a specific band can be covered more quickly with the additional SRS transmission opportunities per subframe). Additionally, faster channel estimation which may be provided in part by the additional SRS transmissions may help increase both the capacity of the network, as well as the throughput perceived by the UE 115-a.

Figure 3 illustrates an example of slot-aligned sTTI resources 300 that supports transmission of SRS in low-latency wireless transmissions. The sTTI resources 300 may be used, for example, in slot-aligned sTTI patterns for low-latency communications between a UE and a base station, as described above with respect to the Figures. 1 and 2. A subframe 310 may have resources that are allocated for uplink communication. Subframe 310 may include two slots: the first slot (slot 0) 315 and the second slot (slot 1) 320 which may correspond to 1ms or legacy LTE TTI slots. Each slot 315 and 320 may include slot-aligned sTTIs that are allocated for low-latency communication, for example, according to a first slot alignment 345 or a second slot alignment 355. Each slot 315 and 320 may include three sTTIs, including a first TTI (TTI-0) 325, a second TTI (TTI-1) 330, and a third TTI (TTI-2) 335, and may have frequency resources corresponding to the bandwidth of the frequency f0 350.

As can be seen from the above, in order to ensure that sTTIs do not cross the slot boundary within the 1ms subframe 310, both 2-symbol and 3-symbol sTTIs may be used within either the 315 slot or the 1ms slot. 320. In the first slot alignment 345, the first sTTI 325 and second sTTI 330 may each have two OFDM symbols, and the third sTTI 335 may have three OFDM symbols. In the second slot alignment 355, the first sTTI 325 may have three symbols, with the second sTTI 330 and third sTTI 335 each having two OFDM symbols. In some examples, a particular subframe 310 may be patterned based on slot 0315 having second slot alignment 355 and slot 1320 having first slot alignment 345 (i.e., a pattern [3,2, 2,2,2,3], which may be referred to herein as pattern 1). In some examples, a subframe 310 may be configured with a pattern based on a slot 0315 and a slot 1 320 having the first slot alignment 345 (i.e., a pattern [2,2,3,2,2,3] , which can referred to herein as pattern 2). Of course, other patterns of 2-symbol and 3-symbol sTTI within slots, and different slot patterns within subframes, may be used, and the examples provided herein are provided for purposes of illustration and description with the understanding that similar techniques can be used for other patterns. Figure 4 illustrates resources within subframes having different sTTI patterns that can be used for SRS transmissions.

Figure 4 illustrates an example of uplink resources 400 within subframes that can support SRS transmission in low latency wireless transmissions. Uplink resources 400 may be used, for example, in slot-aligned sTTI patterns for low-latency communications between a UE and a base station, as described above with respect to Figures 1 through 3 in In this example, a first subframe 405 may be configured with pattern 1 and may have a first sTTI (sTTI-0) 415 having three OFDM symbols, second through fifth sTTIs (sTTI-1 to sTTI-4) 420-435 having each may have two OFDM symbols and a sixth sTTI (sTTI-5) 440 which may have three OFDM symbols. Also in this example, a second subframe 410 may be configured with pattern 2 and may have a first sTTI (sTTI-6) 450 and a second sTTI (sTTI-7) 455 having two OFDM symbols, a third sTTI (sTTI- 8) 460 which has three OFDM symbols, followed by the fourth sTTI (sTTI-9) 465 and the fifth sTTI (sTTI-10) 470 which has two OFDM symbols, and the sixth sTTI (sTTI-11) 475 which has three OFDM symbols.

In some examples, the 3-symbol sTTIs may be configured with resources for SRS 445 transmissions. In such examples, the first 405 subframe may have the SRS 445-a resources present in the sTTI-0415 and SRS 445 resources. -b present in sTTI-5440. The second subframe 410 in such examples may have the SRS 445-c resources present in the sTTI-8460 and the SRS 445-d resources present in the sTTI-11 475. In the case of uplink transmissions that use pattern 1 of the first subframe 405, consecutive subframes will have the sTTIs of 3 adjacent symbols, and therefore the time diversity gain of multiple SRS transmissions 445 within the subframes may be small. In some examples, as will be described in more detail below, SRS 445 transmissions from adjacent sTTIs may be transmitted over different frequency bands for frequency diversity that may allow an entire available bandwidth to be covered with relative frequency. speed. ^s R ^s 445 transmissions in such adjacent sTTIs, in other examples, may be transmitted over the same frequency band, which may allow some time diversity and may be used, for example, in situations where a UE travels at high speed. speed relative to a base station.

For uplink transmissions using pattern 2 of the second subframe 410, the two 3-symbol sTTIs, specifically, the sTTI-8 460 and the sTTI-11 475, are evenly distributed within the second subframe 410 Therefore, in some examples, SRS 445-c and SRS 445-d may be transmitted by using different frequency resources, and additionally, there is a possibility of obtaining some channel time diversity when estimating the channel of a specific band.

Within each 3-symbol sTTI, resources may be reserved for SRS transmission in one symbol, such as the first symbol or the last symbol of a 3-symbol sTTI, therefore patterns of [X, X, SRS] or [SRS, X, X], where X is Data/DMRS/Null. In these cases, the remaining two symbols of each 3-symbol sTTI may be used for uplink and/or DMRS data transmissions (or no transmission may be transmitted in cases where a null symbol may occur). As described above, in some cases the pattern of subframe 1 ([3,2,2,2,2,3]) may be used, and in these cases the pattern of the SRS within the 3-symbol sTTI may be [ X, X, SRS] over the last 3-symbol sTTI of a subframe, which is consistent with the legacy SRS symbol. For the initial 3-symbol sTTI of a subframe, a pattern of [SRS, X, X] or [X, X, SRS], for example, can be used. In some cases, the initial 3-symbol sTTI is configured to have the pattern [SRS, X, X], which can provide less demodulation loss due to power transient times, as will be described in more detail below. If a subframe is configured with pattern 2 ([2,2,3,2,2,3]), then the configuration of the last 3-symbol sTTI may be the same as described above to provide consistency with the subframe's symbol. Legacy SRS and the first 3-symbol sTTI of the subframe can be configured to have [SRS, X, X] or [X, X, SRS], for example.

In some examples, the UEs may be configured to transmit the aperiodic SRS. In such cases, the transmission/location of the SRS may be indicated in the downlink control information (DCI) which may include a grant of the UL, when there is data, or a DMRS to transmit. In some examples, the SRS transmission/location may also be indicated in a DL grant which may indicate that the UE should transmit an sPUCCH transmission. For example, a pattern [DMRS, Data, SRS] may be used over 3-symbol sTTIs where [DMRS, Data] is set on a transmission of the sPUCCH, and SRS transmission is implicitly indicated without a specific grant. In some cases, the SRS can also be used as a payload, with 3-symbol sTTI or 2-symbol sTTI patterns being [Null, Null, SRS], [SRS, Null, Null], [Null, SRS], or [SRS , Null].

In some examples, the UEs may be configured to transmit the periodic SRS. Periodic SRS may be more suitable for scenarios where different bands are assigned to TTI operations and 1 ms sTTIs, in which case SRS transmissions outside the last symbol of a subframe will be less likely to cause interference with data transmissions from other UEs due to being transmitted over a different frequency. Thus, one symbol within each 3-symbol sTTI in such examples can be configured as an SRS symbol, similar to legacy LTE or 1 ms TTI operation where the last symbol of a subframe is an SRS symbol, and used by UEs for periodic SRS transmission. To enable periodic SRS, a base station may, in some instances, configure certain cell-specific SRS sTTIs that are common to all UEs served by the base station. The base station, for each serving UE, may configure UE-specific SRS sTTIs. The cell-specific and UE-specific sTTIs may be defined either during the cell-specific and UE-specific SRS subframes (associated with the legacy LTE service or with a 1 ms TTI service) only, or they may be defined separately. through a different set of subframes. A UE may transmit an SRS with a pattern that is set when its UE-specific SRS sTTI matches the cell-specific SRS sTTI. In addition, UEs do not send the sPUSCH over the SRS symbol that is defined during cell-specific SRS sTTIs, in order to avoid interference with SRS transmissions.

Figure 5 illustrates another example of uplink resources 500 within subframes that can support SRS transmission in low latency wireless transmissions. Uplink resources 500 may be used, for example, in slot-aligned sTTI patterns for low-latency communications between a UE and a base station, as described above with respect to Figures 1 through 3 in In this example, a subframe 505 can be configured with pattern 1 and can have a first sTTI (sTTI-0) 510 that has three OFDM symbols, second through fifth sTTI (sTTI-1 to sTTI-4) 515-530 that can each having two OFDM symbols and a sixth sTTI (sTTI-5) 535 which may have three OFDM symbols.

In some examples, both the 3-symbol sTTI and the 2-symbol sTTI may be configured with the resources for SRS 540 transmissions. In such examples, the 2-symbol sTTI may provide additional SRS opportunities, and the frequency resources for SRS 540 transmissions may be selected to provide frequency hopping that can cover a transmission bandwidth of interest in a relatively short period, and SRS 540 resources for some SRS 540 transmissions may be selected to have the same resources with a large enough time separation to provide good time diversity. Frequency diversity and time diversity can be used to estimate the quality of the uplink channel over the desired transmission bandwidth. In the example of Figure 5, the symbols within each sTTI 510-535 to be used for the SRS transmission can be selected to provide adjacent symbols with the SRS transmissions, which can provide reduced transient times and improve demodulation performance for any data transmission that may occur in the non-symbols of the SRS, as will be described in more detail below. On the 2-symbol sTTI, different symbols such as SRS, SRS], [Null, SRS], [SRS, Null], [DMRS, SRS], [SRS, DMRS], [data, SRS] or [ SRS, data]. The data, SRS, DMRS, null patterns for the 3-symbol sTTIs may include any available combination, such as the patterns described above. In some cases, since each sTTI in such examples includes at least one SRS transmission, the SRS transmissions may be configured according to an aperiodic configuration, which can help reduce the potential impact on simultaneous 1ms transmissions.

Figure 6 illustrates an example of frequency bands in a subframe 600 that may be selected for SRS transmissions in low latency wireless transmissions. Subframe 600 may be used, for example, in low latency communications between a UE and a base station, as described above with respect to Figures 1 and 2. In this example, subframe 600 may be configured with pattern 1 and it may have a first frequency band f-0 605 and a second frequency band f-1 610 which may be used for uplink transmissions. Subframe 600 that is configured with pattern 1 may have a first sTTI (sTTI-o) 615 having three OFDM symbols, second through fifth sTTIs (sTTI-1 to sTTI-4) 620-635 each having two OFDM symbols and a sixth sTTI (sTTI-5) 640 which may have three OFD symbols ^m .

As described above, in some cases, data transmissions, such as PUSCH or sPUSCH transmissions outside of configured SRS symbols, can be transmitted by using a bandwidth that is less than a bandwidth system availability, and SRS 645 transmissions may be transmitted in a different bandwidth than other data transmissions. In some cases, SRS 645 transmissions from a UE may be transmitted according to a frequency hopping pattern that can be configured on the UE, in which SRS 645 transmissions are transmitted on different frequencies in order to obtain the information channel quality across the entire bandwidth of interest at a base station. In the example of Figure 6, a first transmission of SRS 645-a may be transmitted in an initial symbol of an initial sTTI 615 of subframe 600, by using the frequency resources of frequency band f-1 610. A second transmission of SRS 645-b may be transmitted in a last symbol of the last sTTI 640 of subframe 600, by using the frequency resources of frequency band f -0 605. While only two frequency bands are illustrated in Figure 6, additional frequency bands may be presented in some cases, with the frequency resources for SRS transmissions being selected based on a frequency hopping pattern for SRS, for example.

Figure 7 illustrates an example of wireless resources 700 and transient times for SRS transmissions in low latency wireless transmissions. Wireless resources 700 may be used, for example, in low-latency communications between a UE and a base station, as described above with respect to Figures 1 and 2. In this example, a last sTTI 705 of subframe n may be a 3-symbol sTTI and include the resources of the SRS 715-a in a last symbol of the sTTI. A first sTTI 710 of subframe n+1 can be a 3 symbol sTTI and also include the resources of the SRS 715-b in a last symbol of the sTTI. A second sTTI 720 of subframe n+1 may then follow. In this example, the SRS 715 resources are found in a last symbol of a 3-symbol sTTI regardless of the location of the particular sTTI within a subframe. In such cases, transient times associated with SRS transmissions using the SRS 715 resources may occur before and after the SRS transmissions, because the SRS transmissions themselves may be configured to provide SRS at a constant power. over configured resource blocks (RBs), and therefore the transmitting UE uses the time before and after the SRS to perform the power and/or RB allocation change between SRS transmissions and adjacent data transmissions or the DMRS.

Therefore, in cases where the SRS 715 symbols are not consecutive, such as in the example of Figure 7, transients 725 are present adjacent to each SRS 715 resource, with a first transient 725 -a before the first resource of the s Rs 715-a, which is followed by a second transitory time 725-b. Similarly, non-adjacent SRS resource 715-b is preceded by transient time 725-c and followed by transient time 725-d. In some examples, a transient time of 40 ps is allowed to adjust transmit power and/or RB allocation, although other transient times may be used in other examples. In this case, the last sTTI 705 of subframe n has X ps of transient time, corresponding to transient time 725-a. However, the first sTTI 710 of subframe n + 1 has two transient times, corresponding to transient time 725-b and transient time 725-c, resulting in the first sTTI 710 of subframe n + 1 having 2X ps transitory time. In addition, the second sTTI 720 of subframe n + 1 is hit as well, with X ps of transient time, corresponding to transient time 725-d. Therefore, a considerable portion of the first sTTI 710 in subframe n + 1, or within any first sTTI of a subframe, is subjected to time transients that can have a negative impact on demodulation performance. The impact of transient times is reduced, in some examples, by setting the SRS symbols to be adjacent in cases where adjacent sTTIs have SRS transmissions, which is described below with respect to Figure 8.

Figure 8 illustrates another example of wireless resources 800 and transient times for SRS transmissions in low latency wireless transmissions. Wireless resources 800 may be used, for example, in low latency communications between a UE and a base station, as described above with respect to Figures 1 and 2.

In this example, a last sTTI 805 of subframe n can be a 3-symbol sTTI and include the resources of SRS 815-a in a last symbol of sTTI 805. A first sTTI 810 of subframe n+1 can be a sTTI of 3 symbols and include the resources of the SRS 815-b in an initial symbol of the sTTI 810, which provides the resources of the adjacent SRS 815 in subframes n and n + 1. A second sTTI 820 of subframe n+1 may then follow the sTTI 810. In this example, the transient times associated with the SRS transmissions using the SRS resources 815 may again occur before and after the SRS transmissions, but because the SRS resources the SRS 815 are in consecutive symbols the impact on demodulation performance is reduced.

In the example in Figure 8, X ps of the last sTTI 805 of subframe n , corresponding to transient time 825-a, and 1.5X ps of the first sTTI 810 of subframe n + 1, corresponding to transient time 825-cy 1/2 of the 825-d transient time. The 825-d transient time is shared between the sTTI 810 and sTTI 820, which may be due to RB allocation and/or uplink power tuning between the sTTIs. A transient time 825-b may occur between adjacent SRS resources 815 and may be due to a resource block (RB) assignment change, for example, and may be split between the two SRS symbols. Improved demodulation quality may result, compared to the example of Figure 7. Therefore, in some examples, the SRS symbol locations may be selected to provide a reduced transient time for a change in one or more of the SRS symbols. an uplink transmit power or resource block allocation. Such techniques can be used for SRS transmissions in the 3-symbol sTTI and/or for SRS transmissions in the 2-symbol sTTI.

Figure 9 illustrates an example of frequency resources 900 that can support SRS transmission in low latency wireless transmissions. Frequency resources 900 may be used, for example, in low-latency communications between a UE and a base station, as described above with respect to Figures 1 and 2. In this example, a first sTTI (sTTI-0) 905 may include resources that occupy a first channel bandwidth ( f0 ) 910 and SRS 915-a resources that may occupy a first SRS bandwidth 920. The example in Figure 9 also includes a second sTTI ( sTTI-n) 925, which may include resources that occupy a second channel bandwidth (f1) 930 and SRS 915-b resources that may occupy a second SRS bandwidth 935. As described above, the bandwidth for SRS 915 transmissions it may be different from the bandwidth used for data transmissions (eg, sPUSCH transmissions) of a UE.

In some cases, the bandwidth of the SRS 915 transmissions may be dependent on an sTTI length and/or system bandwidth being used for the sTTI transmissions. In legacy LTE and some 1 ms TTI services, a minimum SRS bandwidth can be defined as 4 RBs. In some cases, the minimum SRS bandwidth may be increased for sTTI operation. Such an increase may be allowed because a granularity of resource allocations for sTTIs may be greater than a granularity for TTI resource allocation of 1 ms ( for example, because the sTTI resource allocation is based on a scheme that is block-based), and also because sTTI transmissions can be supported by UEs with good channel conditions ( ^eg UEs closest to base stations). Therefore, in some examples, the minimum SRS bandwidth may be the length of the sTTI and also depend on the system bandwidth. For example, 16 or 20 RB SRS resources may be provided for a 2-symbol sTTI over a 10 or 20 MHz channel bandwidth, while 4 or 8 RB SRS resources may be provided for 2-symbol sTTI transmissions. 2-symbol sTTI over smaller bandwidths. For example, 4 or 8 RB SRS resources can be provided for a 10 or 20 MHz sTTI slot. In that way, frequency hopping through multiple SRS opportunities can be completed faster.

Figure 10 illustrates an example of reference signal multiplexing 1000 that supports the transmission of SRS in low latency wireless transmissions. Reference signal multiplexing 1000 may be used, for example, in low-latency communications between a UE and a base station, as described above with respect to Figures 1 and 2. In this example, a first sTTI (sTTI- o) 1005 may include three symbols, with a last symbol 1025 of the sTTI 1005 being configured with both SRS resources and DMRS resources. In the example of Figure 10, the DMRS and SRS may be multiplexed by providing interleaving of the DMRS 1030 and interleaving of the SRS 1035 within the last symbol 1025 of the first sTTI 1005. The interleaving of the DMRS 1030 and the interleaving of the SRS 1035 can therefore provide a comb-like structure, and the DMRS and SRS that are sent from different users can be made orthogonal.

In the example of Figure 10, the interleaving of the SRS 1035 may cover a system bandwidth f0 1015 that is greater than a second bandwidth f1 that is used for the interleaving of the DMRS 1030. In other examples, the two frequencies f 0 and f 1 can be completely overlapping. In such examples with completely overlapping reference signal resources, the DMRS and SRS may be transmitted on different combs, or on the same comb with different cyclic offsets (CS). In other examples, both DMRS and SRS can both be sent by using the sequences cyclically shifted from a base sequence (ie , SRS is made similar to DMRS). In yet more examples, both DMRS and SRS can be sent without using any interleaving, by using different CSs.

In examples where the bands that are assigned to the DMRS and SRS, f1 and f0, do not completely overlap, such as when one is the superset of the other, as illustrated in Figure 10, the DMRS and SRS of different Users can be sent through different combs. In other examples, SRS may be transmitted using an LTE i-comb structure, similar to legacy DMRS transmissions. It may also be possible to share a symbol between the SRS and the DMRS that is transmitted from the same UE, in some cases. For example, when the DMRS is not precoded, the SRS and DMRS may be sent through different antenna ports from the UE.

Figure 11 illustrates an example process flow 1100 for transmitting the polling reference signal in low latency wireless transmissions. Process flow 1100 may include base station 105-b and UE 115-b, which may be examples of corresponding devices that are described with reference to Figure 1 and 2. Base station 105-b and UE 115-b they may establish a connection 1105 in accordance with connection establishment techniques that are established for the wireless communication system.

At block 1110, base station 105-b may identify that the UL transmissions are to use the sTTIs. Such identification may be made, for example, based on a wireless service that UE 115-b is capable of supporting and must serve UE 115-b through base station 105-b. For example, the UE 115-b may request that a URLLC service be established, which may use sTTIs, such as per-slot sTTIs or 2-symbol sTTIs. The UE 115-b may also support other services (for example, eMMB services) or LTE legacy users that may operate by using a 1 ms TTI, and the base station 105-b may establish communications with the UE 115-b. b and other UEs (not shown) based on 1ms TTI length and can set sTTIs to be slot-aligned for low latency communications based on 1ms TTI subframe time limits . For example, base station 105-b may establish an sTTI configuration in which the sTTIs do not span the subframe time limits or the 1 ms TTI services slot limits.

At block 1115, base station 105-b may identify sTTIs for SRS transmissions. sTTIs for SRS transmissions may be, in some examples, 3-symbol sTTIs, where a 3-symbol sTTI is located within each slot boundary of a subframe that may be configured as a subframe of the SRS. In some examples, the base station 105-b may configure the SRS sTTIs as the cell-specific SRS sTTIs, and may configure the UE 115-b with the UE-specific sTTIs, to be used for cell-specific transmissions. MR. In some cases, cell-specific sTTIs may be found in subframes that are configured as cell-specific SRS subframes for 1 ms TTI services, although cell-specific sTTIs may be found in other subframes as well.

At block 1120, base station 105-b may generate configuration information for SRS transmissions. The configuration information may include information on cell-specific sTTIs and UE-specific sTTIs, for example. In some cases, the configuration information may include sTTI patterns and symbol patterns within sTTIs, along with uplink symbols and resources to be used for SRS transmissions. In some cases, the configuration information may include the multiplexing information that the UE 115-b may use to multiplex the SRS transmissions with other transmissions, such as the DMRS transmissions, within a symbol that is configured with the resources of the SRS. Base station 105-b may transmit configuration information 1125 to UE 115-b.

At block 1130, base station 105-b may allocate the uplink resources for the sTTI(s) for uplink transmissions from UE 115-b. Base station 105-b may allocate sTTI resources based on, for example, buffer information for low latency services to UE 115-b. The resources that are allocated may include, for example, two or more sTTIs that may be configured for SRS transmissions, and base station 105-b may expect to receive the SRS transmissions in the two or more sTTIs that are allocated. An indication of the resources that are allocated may be provided in DCI 1135 that is transmitted to UE 115-b.

In some examples, the base station 105-b may configure the UE 115-b to transmit the aperiodic SRS, and the SRS transmission/location may be indicated in the DCI 1135. In some examples, the SRS transmission/location may also may be indicated in a DL Grant which may indicate that the UE should transmit an sPUCCH transmission. For example, a pattern [DMRS, Data, SRS] may be used over 3-symbol sTTIs where [DMRS, Data] is set on a transmission of the sPUCCH, and SRS transmission is implicitly indicated without a specific grant. In other cases, such SRS transmission may be explicitly signaled by base station 105-b.

At block 1140, UE 115-b may identify sTTIs for uplink transmissions. Uplink sTTIs may be identified based on an uplink grant from base station 105-b, for example. Additionally, a pattern of the sTTI can be identified for the uplink transmissions in cases where the 2-symbol and 3-symbol sTTIs are assigned to the UE 115-b.

At block 1145, UE 115-b may identify sTTIs for SRS transmissions. SRS sTTIs may be identified, for example, based on configuration information 1125, DCI 1135, or combinations thereof. The UE 115-b may also identify an uplink symbol and resources for SRS transmissions within the sTTIs. In instances where the UE 115-b is configured to transmit the periodic SRS, the SRS sTTIs and symbols may be identified based on the cell-specific SRS sTTIs and the UE-specific SRS sTTIs, and the UE 115-b can identify sTTIs for SRS transmissions when its UE-specific SRS sTTI matches the cell-specific SRS sTTI.

At block 1150, UE 115-b may generate uplink data and SRS transmissions. Uplink data may include low latency data to be transmitted to base station 105-b, and SRS transmissions may be located in SRS symbols within an sTTI. The UE 115-b may transmit the uplink transmission(s) 1155 to the base station 105-b by using the sTTIs that are assigned. As mentioned, the uplink transmission(s) 1155 may include uplink data, DMRS transmissions, SRS transmissions, or any combination thereof.

At block 1160, base station 105-b may perform processing on the signal being received for uplink transmissions. Processing of the received signal may include, for example, processing SRS transmissions to determine uplink channel quality over a frequency band associated with the SRS transmission, uplink timing information on based on SRS transmissions or the like. Processing of the received signal may also include demodulation and decoding of the uplink data and generation of feedback (for example, HARQ ACK/NACK feedback) to indicate successful or unsuccessful reception of the data. of the uplink.

Figure 12 shows a block diagram 1200 of a wireless device 1205 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. Wireless device 1205 may be an example of aspects of a user equipment (UE) 115 as described with reference to Figure 1. Wireless device 1205 may include receiver 1210, UE sTTI manager 1215, and transmitter. 1220. The 1205 wireless device can also include a processor. Each of these components may be in communication with each other (for example, through one or more buses).

Receiver 1210 may receive information such as packets, user data, or control information associated with various information channels (eg, control channels, data channels, and information relating to transmission of the reference signal). polling in low latency wireless transmissions, etc.,). The information can be transmitted to other components of the device. Receiver 1210 may be an example of aspects of transceiver 1535 that is described with reference to Figure 15.

The UE sTTI manager 1215 may be an example of aspects of the UE sTTI manager 1515 that is described with reference to Figure 15.

The UE sTTI manager 1215 and/or at least some of its various subcomponents may be implemented in hardware, software that is executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the sTTI manager functions of the UE 1215 and/or at least some of its various subcomponents may be executed by a general purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, discrete gates or transistor logic, discrete hardware components, or any combination thereof that are designed to perform the functions which are described in this disclosure. The UE sTTI manager 1215 and/or at least some of its various subcomponents may be physically located in various locations, including being distributed such that portions of the functions are implemented in different physical locations by one or more physical devices. In some examples, the UE sTTI manager 1215 and/or at least some of its various subcomponents may be a separate and distinct component in accordance with various aspects of the present disclosure. In other examples, the UE sTTI manager 1215 and/or at least some of its various subcomponents may be combined with one or more other hardware components, including, but not limited to an I/O component, a transceiver , a network server, another computing device, one or more other components described in this disclosure, or a combination thereof in accordance with various aspects of this disclosure.

The sTTI manager of UE 1215 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs are located within subframe time boundaries of a subframe of a second wireless service, identify two or more sTTIs within the set of sTTIs for the transmission of sounding reference signal (SRS) transmissions within subframe time limits, and transmit one or more SRS transmissions in at least one of the two or more sTTI.

Transmitter 1220 may transmit signals that are generated by other components of the device. In some examples, transmitter 1220 may be co-located with receiver 1210 in a transceiver module. For example, transmitter 1220 may be an example of aspects of transceiver 1535 that is described with reference to Figure 15. Transmitter 1220 may include a single antenna or may include an array of antennas.

Figure 13 shows a block diagram 1300 of a wireless device 1305 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. Wireless device 1305 may be an example of aspects of a wireless device 1205 or UE 115 as described with reference to the Figures. 1 and 12. Wireless device 1305 may include receiver 1310, UE sTTI manager 1315, and transmitter 1320. Wireless device 1305 may also include a processor. Each of these components may be in communication with each other (for example, through one or more buses).

Receiver 1310 may receive information such as packets, user data, or control information associated with various information channels (eg , control channels, data channels, and information relating to the transmission of the reference signal). polling in low latency wireless transmissions, etc.). The information can be transmitted to other components of the device. Receiver 1310 may be an example of aspects of transceiver 1535 that is described with reference to Figure 15.

The UE sTTI manager 1315 may be an example of aspects of the UE sTTI manager 1515 that is described with reference to Figure 15. The UE sTTI manager 1315 may also include the sTTI identification component 1325, the identification component of the SRS 1330 and the generation component of the SRS 1335.

The STTI identification component 1325 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs being located within subframe time boundaries of a subframe of a second wireless service. In some cases, a first subset of the set of sTTIs each spanning two OFDM symbols may be identified and a second subset of the set of sTTIs each spanning three OFDM symbols may be identified.

The SRS identification component 1330 may identify two or more sTTIs within the set of sTTIs for transmission of one or more SRS transmissions within the time limits of the subframe, and configure the two or more sTTIs in the second subset for transmission. the one or more SRS transmissions. In some cases, a number of SRS transmissions within subframe time limits may be configured by a base station. SRS generation component 1335 may generate SRS patterns and transmit, via transmitter 1320, the one or more SRS transmissions.

Transmitter 1320 may transmit signals that are generated by other components of the device. In some examples, transmitter 1320 may be co-located with receiver 1310 in a transceiver module. For example, transmitter 1320 may be an example of aspects of transceiver 1535 that is described with reference to Figure 15. Transmitter 1320 may include a single antenna or may include an array of antennas.

Figure 14 shows a block diagram 1400 of a UE sTTI manager 1415 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The UE sTTI manager 1415 may be an example of aspects of a UE sTTI manager 1215, a UE sTTI manager 1315, or a UE sTTI manager 1515 that is described with reference to Figures 12, 13 and 15. The UE sTTI handler 1415 may include the sTTI identification component 1420, the SRS identification component 1425, the SRS generation component 1430, the SRS symbol selection component 1435, the the SRS 1440 frequency selection module, the SRS 1445 configuration component, and the 1450 multiplexing component. Each of these modules can communicate, directly or indirectly, with each other (for example, through one or more buses) .

The identification component of the sTTI 1420 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs are located within the subframe time limits of a subframe of a second wireless service, identify a first subset of the set of sTTI each spanning two OFDM symbols and identifying a second subset of the set of sTTI each spanning three OFDM symbols.

The identification component of the SRS 1425 may identify two or more sTTIs within the set of sTTIs for the transmission of one or more transmissions of ^s R ^s within the time limits of the subframe, and configure the two or more sTTIs of the second subset for one or more SRS transmissions. In some cases, a number of SRS transmissions within subframe time limits may be configured by a base station. The SRS generation component 1430 may generate SRS patterns and transmit the one or more SRS transmissions.

The SRS symbol selection component 1435 may select the SRS symbol location within an sTTI. In some examples, the SRS symbol locations within the first slot may be selected to be either a start symbol or a last symbol of an associated three-symbol sTTI. In some cases, the symbol location of the SRS within the second slot is selected to be the last symbol of the associated three-symbol sTTI. In some cases, identification of the second subset includes identification of a first three-symbol sTTI as a start sTTI of a first slot within subframe time limits, identification of a second three-symbol sTTI as a trailing sTTI of a second slot within the time limits of the subframe, and identify a first or initial SRS symbol within the first three-symbol sTTI for a first SRS transmission and a second SRS symbol within the second three-symbol sTTI. symbols for a second SRS transmission, where the second SRS symbol of a first subframe is adjacent to the first SRS symbol of a subsequent subframe. In some cases, the locations of the first SRS symbol and the second SRS symbol are selected to provide a reduced transient time for a change in one or more of an associated uplink transmit power or resource block allocation. with the first SRS transmission and the second SRS transmission. In some cases, identification of the second subset includes identification of a final sTTI within each of a first slot and a second slot within the time limits of the subframe as three-symbol sTTIs. In some cases, an SRS symbol location within each sTTI of the second subset is selected to provide time diversity between subsequent SRS transmissions and where frequency bands for subsequent SRS transmissions are selected to provide frequency diversity. between subsequent SRS transmissions.

In some cases, two or more two-symbol sTTIs within each of a first slot and a second slot within subframe time limits are configured for transmissions of s Rs . In some cases, one or both of the OFDM symbols within the two or more two-symbol sTTIs are configured for SRS transmissions.

The SRS frequency selection component 1440 may select a first frequency band for the first SRS transmission, select a second frequency band for the second SRS transmission that is different from the first frequency band, where the first frequency band frequency band and the second frequency band are selected to provide frequency diversity between the first SRS transmission and the second SRS transmission. In some cases, a first bandwidth for the one or more transmissions of SRS may be identified based on one or more of a channel bandwidth or sTTI length for uplink transmissions. In some cases, the first bandwidth for a first SRS transmission is increased relative to a second bandwidth for one or more other SRS transmissions associated with the second wireless service.

The SRS configuration component 1445 may identify aperiodic or periodic configurations for SRS transmissions, in some examples. The SRS configuration component 1445 may, for example, receive an aperiodic configuration on an uplink grant indicating the resources for the one or more SRS transmissions, receive a downlink grant indicating that a transmission of the uplink control channel, determining, based on the downlink grant, that the one or more SRS transmissions should be transmitted. For periodic configurations, the configuration component of the SRS 1445 can receive the configuration information indicating the resources for the periodic SRS transmissions. In some cases, the periodic configuration information includes an indication of the cell-specific sTTIs and the UE-specific sTTIs to be used for SRS transmissions, and a first sTTI for SRS transmission may be identified when the first sTTI corresponds. to both a cell-specific sTTI and a UE-specific sTTI. In some cases, an indication may be received that data and a DMRS should be transmitted in two symbols of a three-symbol sTTI, and it may be determined to transmit the sRs in the third symbol of the three-symbol sTTI. In some cases, the one or more SRS streams are used as payload in one or more sTTIs that do not otherwise contain the uplink streams.

Multiplexing component 1450 may multiplex a DMRS with a first SRS into a first symbol that is configured for transmission of both the DMR ^s and the SRS. In some cases, the multiplexing includes transmitting the DMR ^s in a first symbol interleave and transmitting the first SRS in a second first symbol interleave. In some cases, the multiplexing includes transmitting the DMRS in a first symbol interleave using a first cyclic shift and transmitting the first SRS in the first symbol interleave using a second cyclic shift. In some cases, the multiplexing includes transmitting the DMRS using a first set of antenna ports and transmitting the first SRS using a second set of antenna ports that is different from the first set of antenna ports.

Figure 15 shows a diagram of a system 1500 including a device 1505 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. Device 1505 may be an example of or include the components of wireless device 1205, wireless device 1305, or a UE 115 as described above, for example, with reference to Figures 1, 12, and 13. Device 1505 may include the components for two-way voice and data communications, including components for transmitting and receiving communications, including UE sTTI manager 1515, processor 1520, memory 1525, software 1530, transceiver 1535, antenna 1540 and the 1545 I/O controller. These components may be in electronic communication over one or more buses (for example, the 1510 bus). Device 1505 may communicate wirelessly with one or more base stations 105.

Processor 1520 may include an intelligent hardware device (for example, a general purpose processor, DSP, central processing unit (CPU), microcontroller, ASIC, FPGA, programmable logic device, discrete or transistor logic gate, a discrete hardware component, or any combination thereof). In some cases, processor 1520 may be configured to operate a memory array through the use of a memory controller. In other cases, a memory controller may be integrated into processor 1520. Processor 1520 may be configured to execute computer-readable instructions that are stored in memory to perform various functions (for example, functions or tasks that support signal transmission polling benchmark in low-latency wireless transmissions).

Memory 1525 may include random access memory (RAM) and read only memory (ROM). Memory 1525 may store computer-readable and computer-executable software 1530, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, memory 1525 may contain, among other things, a basic input/output system (BIOS) that may control basic hardware and/or software operation, such as interaction with peripheral components or devices.

Software 1530 may include code to implement aspects of the present disclosure, including code to support transmission of the polling reference signal in low latency wireless transmissions. Software 1530 may be stored on a non-transient computer readable medium such as system memory or other memory. In some cases, the 1530 software may not be directly executed by the processor, but may cause a computer (eg, when compiled and executed) to perform functions described herein.

The 1535 transceiver can communicate bidirectionally, through one or more antennas, wired or wireless links as described above. For example, transceiver 1535 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 1535 may also include a modem for modulating the packets and providing the modulated packets to the antennas for transmission and for demodulating packets that are received from the antennas.

In some cases, the wireless device may include a single antenna 1540. However, in some cases, the device may have more than one antenna 1540, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions.

The 1545 I/O controller can handle input and output signals for the 1505 device. The 1545 I/O controller can also handle peripherals that are built into the 1505 device. In some cases, the I/O controller 1545 can represent a physical connection or port to an external peripheral. In some cases, the 1545 I/O controller may use an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another popular operating system. In other cases, the 1545 I/O controller may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the 1545 I/O controller may be implemented as part of a processor. In some cases, a user may interact with the 1505 device through the 1545 I/O controller or through hardware components that are controlled by the 1545 I/O controller.

Figure 16 shows a block diagram 1600 of a wireless device 1605 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. Wireless device 1605 may be an example of aspects of a base station 105 as described with reference to Figure 1. Wireless device 1605 may include receiver 1610, base station sTTI manager 1615, and transmitter 1620. Wireless device 1605 may also include a processor. Each of these components may be in communication with each other (for example, through one or more buses).

Receiver 1610 may receive information such as packets, user data, or control information associated with various information channels (eg, control channels, data channels, and information relating to transmission of the reference signal). polling in low latency wireless transmissions, etc.). The information can be transmitted to other components of the device. Receiver 1610 may be an example of aspects of transceiver 1935 that are described with reference to Figure 19.

Base station sTTI manager 1615 may be an example of aspects of base station sTTI manager 1915 that are described with reference to Figure 19.

Base station sTTI manager 1615 and/or at least some of its various subcomponents may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the base station sTTI manager functions 1615 and/or at least some of its various subcomponents may be executed by a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, a discrete or transistor logic gate, discrete hardware components, or any combination thereof that are designed to perform the functions described in this disclosure. The base station sTTI manager 1615 and/or at least some of its various subcomponents may be physically located in various locations, including being distributed such that portions of the functions are implemented in different physical locations by one or more devices. physical. In some examples, base station sTTI manager 1615 and/or at least some of its various subcomponents may be a separate and distinct component in accordance with various aspects of the present disclosure. In other examples, base station sTTI manager 1615 and/or at least some of its various subcomponents may be combined with one or more other hardware components, including, but not limited to an I/O component, a transceiver, a network server, another computing device, one or more other components described in this disclosure, or a combination thereof in accordance with various aspects of this disclosure.

The base station sTTI manager 1615 can identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs are located within the time limits of the subframe of a subframe of a second wireless service. , identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within subframe time limits, and configure a UE to transmit one or more SRS transmissions in at least one of the two or more sTTI.

Transmitter 1620 may transmit signals that are generated by other components of the device. In some examples, transmitter 1620 may be co-located with receiver 1610 in a transceiver module. For example, transmitter 1620 may be an example of aspects of transceiver 1935 that are described with reference to Figure 19. Transmitter 1620 may include a single antenna or may include an array of antennas.

Figure 17 shows a block diagram 1700 of a wireless device 1705 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. Wireless device 1705 may be an example of aspects of a wireless device 1605 or base station 105 as described with reference to Figures 1 and 16. Wireless device 1705 may include receiver 1710, station sTTI manager base 1715 and transmitter 1720. Wireless device 1705 may also include a processor. Each of these components may be in communication with each other (for example, through one or more buses).

Receiver 1710 may receive information such as packets, user data, or control information associated with various information channels (eg, control channels, data channels, and information that relate to the transmission of the reference signal). polling in low latency wireless transmissions, etc.). The information can be transmitted to other components of the device. Receiver 1710 may be an example of aspects of transceiver 1935 that are described with reference to Figure 19.

Base station sTTI manager 1715 may be an example of aspects of base station sTTI manager 1915 that are described with reference to Figure 19. Base station sTTI manager 1715 may also include the component of sTTI 1725 identification, the SRS 1730 identification component and the SRS 1735 configuration component.

The sTTI identification component 1725 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that fall within the subframe time boundaries of a subframe of a second wireless service, configuring a first subset of the set of sTTIs each spanning two OFDM symbols and a second subset of the set of sTTIs each spanning three OFDM symbols. In some cases, configuring the second subset includes configuring a final sTTI within each of a first slot and a second slot within the time limits of the subframe as three-symbol sTTIs.

The SRS identification component 1730 may identify two or more sTTIs within the set of sTTIs for transmission of one or more SRS transmissions within subframe time limits.

The SRS configuration component 1735 may configure a UE to transmit the one or more SRS transmissions. In some cases, the SRS configuration component 1735 may configure two or more sTTIs from the second subset for the one or more SRS transmissions. In some cases, the SRS configuration component 1735 may transmit an aperiodic configuration in an uplink grant to the UE indicating the resources for the one or more SRS transmissions, or transmit a downlink grant to the UE indicating that one uplink control channel transmission must be transmitted and that one or more SRS transmissions must be transmitted. In some examples, the SRS configuration component 1735 may transmit configuration information indicating resources for periodic SRS transmissions, such as an indication of cell-specific sTTIs and UE-specific sTTIs to be used for transmissions. SRS transmissions, where a first sTTI for the SRS transmission can be identified where the first sTTI corresponds to both a cell-specific sTTI and a UE-specific sTTI. In some cases, the determination that the one or more SRS transmissions should be transmitted is based on an indication in the downlink grant that data and a DMRS should be transmitted in two symbols of a three-symbol sTTI.

Transmitter 1720 may transmit signals that are generated by other components of the device. In some examples, transmitter 1720 may be co-located with receiver 1710 in a transceiver module. For example, transmitter 1720 may be an example of aspects of transceiver 1935 that are described with reference to Figure 19. Transmitter 1720 may include a single antenna or may include an array of antennas.

Figure 18 shows a block diagram 1800 of a base station sTTI manager 1815 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The base station sTTI manager 1815 may be an example of aspects of a base station sTTI manager 1915 that are described with reference to Figure 16, 17, and 19. The base station sTTI manager 1815 may include the sTTI 1820 identification component, the SRS 1825 identification component, the SRS 1830 configuration component, the SRS 1835 symbol selection component, the SRS 1840 frequency selection component, and the 1845 multiplexing component. Each of these modules can communicate, directly or indirectly, with each other (eg, through one or more buses).

The sTTI identification component 1820 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that are located within subframe time boundaries of a subframe of a second wireless service, and configuring a first subset of the set of sTTIs each spanning two OFDM symbols and a second subset of the set of sTTIs each spanning three OFDM symbols. In some cases, the second subset configuration includes configuring a final sTTI within each of a first slot and a second slot within the time limits of the subframe as the three symbol sTTIs.

The SRS identification component 1825 may identify two or more sTTIs within the set of sTTIs for transmission of one or more SRS transmissions within subframe time limits.

The SRS configuration component 1830 may configure a UE to transmit the one or more SRS transmissions. In some cases, the SRS configuration component 1830 may configure two or more sTTIs from the second subset for the one or more SRS transmissions. In some cases, the SRS configuration component 1830 may transmit an aperiodic configuration in an uplink grant to the UE indicating the resources for the one or more SRS transmissions, or transmit a downlink grant to the UE indicating that one uplink control channel transmission must be transmitted and that the one or more SRS transmissions must be transmitted. In some examples, the SRS configuration component 1830 may transmit configuration information indicating resources for periodic SRS transmissions, such as an indication of cell-specific sTTIs and UE-specific sTTIs to be used for SRS transmissions, where a first sTTI for the SRS transmission can be identified where the first sTTI corresponds to both a cell-specific sTTI and a UE-specific sTTI. In some cases, the determination that the one or more SRS transmissions should be transmitted is based on an indication in the downlink grant that data and a DMRS should be transmitted in two symbols of a three-symbol sTTI.

The symbol selection component of the SRS 1835 may, in some cases, configure a first three-symbol sTTI as an initial sTTI of a first slot within subframe time limits, configure a second three-symbol sTTI as a end sTTI of a second slot within subframe time limits, and configuring a first SRS symbol within the first three-symbol sTTI for a first SRS transmission and a second SRS symbol within the second three-symbol sTTI symbols for a second SRS transmission, where the second symbol of a first subframe is adjacent to the first symbol of a subsequent subframe. In some cases, the locations of the first SRS symbol and the second SRS symbol are selected to provide a reduced transient time for a change in one or more of an associated uplink transmit power or resource block allocation. with the first SRS transmission and the second SRS transmission. In some cases, one or both OFDM symbols within two or more two-symbol sTTIs may be configured for SRS transmissions.

The SRS frequency selection component 1840 may identify a first bandwidth for a first SRS transmission from the one or more SRS transmissions based on one or more of a channel bandwidth or sTTI length for uplink transmissions.

The multiplexing component 1845 may configure the UE to multiplex a DMRS with a first SRS transmission on a first symbol, receive the DMRS on a first symbol first interlace, receive the first SRS transmission on a second first symbol interlace, receive the DMRS on a first symbol interleave using a first cyclic offset, receive the first SRS transmission on a first symbol first interleave using a second cyclic offset, receive the DMRS using a first set of antenna ports and receive the first SRS transmission by using a second set of antenna ports that is different from the first set of antenna ports.

Figure 19 shows a diagram of a system 1900 including a device 1905 that supports transmission of the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. Device 1905 may be an example of or include the components of base station 105 as described above, for example, with reference to Figure 1. Device 1905 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including base station sTTI manager 1915, processor 1920, memory 1925, software 1930, transceiver 1935, antenna 1940, network communications manager 1945, and manager of base station communications 1950. These components may be in electronic communication over one or more buses (eg, bus 1910). The 1905 device can communicate wirelessly with one or more UE 115s.

Processor 1920 may include an intelligent hardware device, (for example, a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate component, or transistor logic). , a discrete hardware component, or any combination thereof). In some cases, processor 1920 may be configured to operate a memory array through the use of a memory controller. In other cases, a memory controller may be integrated into processor 1920. Processor 1920 may be configured to execute computer-readable instructions that are stored in memory to perform various functions (for example, functions or tasks that support signal transmission polling benchmark in low-latency wireless transmissions).

Memory 1925 may include RAM and ROM. Memory 1925 may store computer-readable, computer-executable software 1930, which includes instructions that, when executed, cause the processor to perform various functions described herein. In some cases, memory 1925 may contain, among other things, a BIOS that may control basic hardware and/or software operation, such as interaction with peripheral components or devices.

Software 1930 may include code to implement aspects of the present disclosure, including code to support transmission of the polling reference signal in low latency wireless transmissions. Software 1930 may be stored on a non-transient computer readable medium such as system memory or other memory. In some cases, the 1930 software may not be directly executed by the processor, but may cause a computer (eg, when compiled and executed) to perform functions described herein.

The 1935 transceiver can communicate bidirectionally, through one or more antennas, wired or wireless links as described above. For example, transceiver 1935 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. Transceiver 1935 may also include a modem for modulating the packets and providing the modulated packets to the antennas for transmission, and for demodulating packets that are received from the antennas.

In some cases, the wireless device may include a single antenna 1940. However, in some cases, the device may have more than one antenna 1940, which may be capable of simultaneously transmitting or receiving multiple wireless transmissions.

Network communications manager 1945 may manage communications with the core network (eg, over one or more wired return links). For example, network communications manager 1945 may manage the transfer of data communications for client devices, such as one or more UEs 115. Base station communications manager 1950 may manage communications with another base station 105 and may include a controller or scheduler to control communications with UEs 115 in cooperation with other base stations 105. For example, base station communications manager 1950 may coordinate the scheduling of transmissions to UEs 115 for various mitigation techniques interference, such as beamforming or co-transmission. In some examples, base station communications manager 1950 may provide an X2 interface within a Long Term Evolution (LTE)/LTE-A wireless communication network technology to provide communication between base stations 105.

Figure 20 shows a flow chart illustrating a method 2000 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 2000 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2000 may be performed by a UE ^s TT ⁱ manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2005, the UE 115 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time limits of a subframe of a second wireless service. . The operations of block 2005 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2005 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2010 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of SRS transmissions within subframe time limits. The operations of block 2010 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2010 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15.

At block 2015, the UE 115 may transmit one or more SRS transmissions in at least one of the two or more sTTIs. The operations of block 2015 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2015 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 21 shows a flow chart illustrating a method 2100 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of procedure 2100 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2100 may be performed by a UE ^s TT ⁱ manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2105, the UE 115 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time limits of a subframe of a second wireless service. . The operations of block 2105 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2105 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2110 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 2110 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2110 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15.

At block 2115, the UE 115 may identify a first subset of the sTTI set each spanning two OFDM symbols and a second subset of the sTTI set each spanning three OFDM symbols. The operations of block 2115 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2115 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15. At block 2120, UE 115 may configure the two or more sTTIs of the second subset for SRS transmissions. The operations of block 2120 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2120 may be performed by an identification component of the SRS as described referring to Figures 12 through 15. At block 2125, UE 115 may transmit one or more SRS transmissions in at least one of two or more sTTIs. The operations of block 2125 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2125 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 22 shows a flow chart illustrating a method 2200 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of procedure 2200 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2200 may be performed by a UE ^s TT ⁱ manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2205, the UE 115 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time limits of a subframe of a second wireless service. . The operations of block 2205 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2205 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2210 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 2210 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2210 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15.

At block 2215, the UE 115 may select a first frequency band for the first SRS transmission. The operations of block 2215 can be performed according to the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2215 may be performed by a frequency selection component of the SRS as described with reference to Figures 12 through 15.

At block 2220 the UE 115 may select a second frequency band for the second SRS transmission that is different from the first frequency band, wherein the first frequency band and the second frequency band are selected to provide diversity. of frequency between the first transmission of SRS and the second transmission of s Rs . The operations of block 2220 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2220 may be performed by a frequency selection component of the SRS such as was described with reference to Figures 12 to 15.

At block 2225, the UE 115 may transmit the SRS transmissions. The operations of block 2225 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2225 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 23 shows a flow chart illustrating a method 2300 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of procedure 2300 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2300 may be performed by a UE sTTi manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements of the device. to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2305, the UE 115 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second wireless service. . The operations of block 2305 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2305 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2310 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 2310 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2310 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15.

At block 2315, the UE 115 may identify a subset of the set of sTTIs, each spanning two OFDM symbols. The operations of block 2315 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2315 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2320, the UE 115 may configure the two or more subset sTTIs for SRS transmissions. The operations of block 2320 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2320 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15. At block 2325 the UE 115 may transmit the SRS transmissions. The operations of block 2325 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2325 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 24 shows a flow chart illustrating a method 2400 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of procedure 2400 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2400 may be performed by a UE ^s TT ⁱ manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements of device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2405, UE 115 may receive an aperiodic configuration in an uplink grant indicating the resources for one or more SRS transmissions. The operations of block 2405 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2405 may be performed by a configuration component of the SRS as described with reference to Figures 12 through 15, which may operate in cooperation with a receiver 1210 or 1310 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

At block 2410, the UE 115 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time limits of a subframe of a second wireless service. . The operations of block 2410 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2410 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2415 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of one or more SRS transmissions within subframe time limits. The operations of block 2415 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2415 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15.

At block 2420 the UE 115 may transmit the one or more SRS transmissions. The operations of block 2420 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2420 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 25 shows a flow chart illustrating a method 2500 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of procedure 2500 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2500 may be performed by a UE sTTI manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements of the device. to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2505, the UE 115 may receive a downlink grant indicating that an uplink control channel transmission should be transmitted. The operations of block 2505 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2505 may be performed by a configuration component of the SRS as described with reference to Figures 12 through 15, which may operate in cooperation with a receiver 1210 or 1310 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

At block 2510, the UE 115 may determine, based at least in part on the downlink grant, that one or more SRS transmissions should be transmitted. The operations of block 2510 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2510 may be performed by a configuration component of the SRS as described with reference to Figures 12 to 15.

At block 2515, the UE 115 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time limits of a subframe of a second wireless service. . The operations of block 2515 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2515 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2520 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of one or more SRS transmissions within subframe time limits. The operations of block 2520 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In In certain examples, aspects of the operations of block 2520 may be performed by an identification component of the SRS as described with reference to Figures 12 through 15.

At block 2525 the UE 115 may transmit the one or more SRS transmissions. The operations of block 2525 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2525 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 26 shows a flow chart illustrating a method 2600 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of procedure 2600 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2600 may be performed by a UE ^s TT ⁱ manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2605, UE 115 may receive configuration information indicating resources for periodic SRS transmissions. The operations of block 2605 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2605 may be performed by a configuration component of the SRS as described with reference to Figures 12 through 15, which may operate in cooperation with a receiver 1210 or 1310 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

At block 2610, the UE 115 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time limits of a subframe of a second wireless service. . The operations of block 2610 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2610 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2615 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of one or more SRS transmissions within subframe time limits. The operations of block 2615 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2615 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15.

At block 2620 the UE 115 may transmit the one or more SRS transmissions. The operations of block 2620 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2620 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 27 shows a flow chart illustrating a method 2700 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of procedure 2700 may be implemented by a UE 115 or its components as described herein. For example, the operations of procedure 2700 may be performed by a UE ^s TT ⁱ manager as described with reference to Figures 12 through 15. In some examples, a UE 115 may execute a set of codes to control functional elements device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2705, the UE 115 may identify a set of sTTIs for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time limits of a subframe of a second wireless service. . The operations of block 2705 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2705 may be performed by an identification component of the sTTI as described with Refer to Figures 12 through 15.

At block 2710 the UE 115 may identify two or more sTTIs within the set of sTTIs for transmission of one or more SRS transmissions within subframe time limits. The operations of block 2710 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2710 may be performed by an identification component of the SRS as described with reference to Figures 12 to 15.

At block 2715, the UE 115 may multiplex a DMRS with a first SRS into a first symbol that is configured for both DMRS and SRS transmission. The operations of block 2715 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2715 may be performed by a multiplexing component as described with reference to Figures 12 to 15.

At block 2720 the UE 115 may transmit the one or more SRS transmissions. The operations of block 2720 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2720 may be performed by an SRS generation component as described with reference to Figures 12 through 15, which may cooperate with a transmitter 1220 or 1320 as described with reference to Figures 12 or 13, or the antenna(s) 1540 and transceiver(s). es) 1535 as described with reference to Figure 15.

Figure 28 shows a flow chart illustrating a method 2800 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 2800 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 2800 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2805, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 2805 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2805 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 2810 base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within subframe time limits. The operations of block 2810 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2810 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 2815, base station 105 may configure a UE to transmit the one or more SRS transmissions in at least one or the two or more sTTIs. The operations of block 2815 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2815 may be performed by a configuration component of the SRS as described with reference to Figures 16 to 19.

Figure 29 shows a flow chart illustrating a method 2900 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 2900 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 2900 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 2905, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 2905 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2905 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 2910 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 2910 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2910 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 2915, base station 105 may configure a first subset of the sTTI set each spanning two OFDM symbols and a second subset of the sTTI set each spanning three OFDM symbols. The operations of block 2915 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2915 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19. At block 2920, base station 105 may configure the two or more sTTIs of the second subset for SRS transmissions. The operations of block 2920 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2920 may be performed by a configuration component of the SRS as described with reference to Figures 16 to 19.

At block 2925, base station 105 may configure a UE to transmit the one or more SRS transmissions on the two or more sTTIs. The operations of block 2925 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 2925 may be performed by a configuration component of the SRS as described with reference to Figures 16 to 19.

Figure 30 shows a flow chart illustrating a method 3000 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 3000 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 3000 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 3005, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 3005 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3005 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3010 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 3010 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3010 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 3015, base station 105 may identify a subset of the set of sTTIs, each spanning two OFDM symbols. The operations of block 3015 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3015 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3020, base station 105 may configure two or more subset sTTIs for SRS transmissions. The operations of block 3020 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3020 may be performed by a configuration component of the SRS as described referring to Figures 16 through 19. At block 3025, base station 105 may configure a UE to transmit one or more SRS transmissions on the two or more sTTIs. The operations of block 3025 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3025 may be performed by a configuration component of the SRS as described with reference to Figures 16 to 19.

Figure 31 shows a flowchart illustrating a procedure 3100 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the this disclosure. The operations of method 3100 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 3100 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 3105, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 3105 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3105 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3110 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 3110 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3110 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 3115, base station 105 may configure a UE to transmit one or more SRS transmissions on the two or more sTTIs. The operations of block 3115 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3115 may be performed by a configuration component of the SRS as described with reference to Figures 16 to 19.

At block 3120, base station 105 may transmit an aperiodic pattern in an uplink grant to the UE indicating the resources for the one or more SRS transmissions. The operations of block 3120 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3120 may be performed by a configuration component of the SRS as described with reference to Figures 16 through 19, which may cooperate with a transmitter 1620 or 1720 as described with reference to Figures 16 or 17, or the antenna(s) 1940 and transceiver(s). es) 1935 as described with reference to Figure 19.

Figure 32 shows a flow chart illustrating a method 3200 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 3200 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 3200 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 3205, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 3205 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3205 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3210 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 3210 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3210 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 3215, base station 105 may configure a UE to transmit one or more SRS transmissions on the two or more sTTIs. The operations of block 3215 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3215 may be performed by a configuration component of the SRS as described with reference to Figures 16 to 19.

At block 3220, base station 105 may transmit a downlink grant to the UE indicating that an uplink control channel transmission is to be transmitted and that one or more transmissions are to be transmitted. more SRS transmissions. The operations of block 3220 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3220 may be performed by a configuration component of the SRS as described with reference to Figures 16 through 19, which may cooperate with a transmitter 1620 or 1720 as described with reference to Figures 16 or 17, or the antenna(s) 1940 and transceiver(s). es) 1935 as described with reference to Figure 19.

Figure 33 shows a flow chart illustrating a method 3300 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 3300 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 3300 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 3305, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 3305 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3305 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3310 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 3310 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3310 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 3315, base station 105 may transmit configuration information indicating resources for periodic SRS transmissions. The operations of block 3315 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3315 may be performed by a configuration component of the SRS as described with reference to Figures 16 through 19, which may cooperate with a transmitter 1620 or 1720 as described with reference to Figures 16 or 17, or the antenna(s) 1940 and transceiver(s). es) 1935 as described with reference to Figure 19.

Figure 34 shows a flow chart illustrating a method 3400 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 3400 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 3400 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 3405, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 3405 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3405 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3410 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 3410 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3410 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 3415, base station 105 may configure the UE to multiplex a DMRS with a first SRS transmission into a first symbol. The operations of block 3415 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3415 may be performed by a multiplexing component as described with reference to Figures 16 to 19.

At block 3420, base station 105 may receive the DMRS in a first symbol interleave. The operations of block 3420 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3420 may be performed by a multiplexing component as described with reference to Figures 16 through 19, which may operate in cooperation with a receiver 1610 or 1710 as described with reference to Figures 16 or 17, or antenna(s) 1940 and transceiver(s) 1935 as described with reference to Figure 19.

At block 3425, base station 105 may receive the first SRS transmission in a second interleave of the first symbol. The operations of block 3425 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3425 may be performed by a multiplexing component as described with reference to Figures 16 through 19, which may operate in cooperation with a receiver 1610 or 1710 as described with reference to Figures 16 or 17, or antenna(s) 1940 and transceiver(s) 1935 as described with reference to Figure 19.

Figure 35 shows a flow chart illustrating a method 3500 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 3500 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 3500 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 3505, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 3505 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3505 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3510 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 3510 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3510 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 3515, base station 105 may configure the UE to multiplex a DMRS with a first SRS transmission into a first symbol. The operations of block 3515 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3515 may be performed by a multiplexing component as described with reference to Figures 16 to 19.

At block 3520, base station 105 may receive the DMRS in a first symbol interleave using a first cyclic shift. The operations of block 3520 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3520 may be performed by a multiplexing component as described with reference to Figures 16 through 19, which may operate in cooperation with a receiver 1610 or 1710 as described with reference to Figures 16 or 17, or antenna(s) 1940 and transceiver(s) 1935 as described with reference to Figure 19.

At block 3525, base station 105 may receive the first SRS transmission on the first symbol interleave by using a second cyclic shift. The operations of block 3525 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3525 may be performed by a multiplexing component as described with reference to Figures 16 through 19, which may operate in cooperation with a receiver 1610 or 1710 as described with reference to Figures 16 or 17, or antenna(s) 1940 and transceiver(s) 1935 as described with reference to Figure 19.

Figure 36 shows a flow chart illustrating a method 3600 for transmitting the polling reference signal in low latency wireless transmissions in accordance with various aspects of the present disclosure. The operations of method 3600 may be implemented by base station 105 or its components as described herein. For example, the operations of procedure 3600 may be performed by a base station sTTI manager as described with reference to Figures 16 through 19. In some examples, a base station 105 may execute a set of codes to control elements functionalities of the device to perform the functions described below. Additionally or alternatively, the base station 105 may perform aspects of the functions described below through the use of special purpose hardware.

At block 3605, base station 105 may identify a set of sTTIs for uplink transmissions of a first wireless service, the set of sTTIs that falls within subframe time boundaries of a subframe of a second service. wireless. The operations of block 3605 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3605 may be performed by an identification component of the sTTI as described with Refer to Figures 16 through 19.

At block 3610 the base station 105 may identify two or more sTTIs within the set of sTTIs for transmission of the SRS transmissions within the time limits of the subframe. The operations of block 3610 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3610 may be performed by an identification component of the SRS as described with reference to Figures 16 to 19.

At block 3615, base station 105 may configure the UE to multiplex a DMRS with a first SRS transmission into a first symbol. The operations of block 3615 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3615 may be performed by a multiplexing component as described with reference to Figures 16 to 19.

At block 3620, base station 105 may receive DMRS through the use of a first set of antenna ports. The operations of block 3620 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3620 may be performed by a multiplexing component as described with reference to Figures 16 through 19, which may operate in cooperation with a receiver 1610 or 1710 as described with reference to Figures 16 or 17, or antenna(s) 1940 and transceiver(s) 1935 as described with reference to Figure 19.

At block 3625, base station 105 may receive the first SRS transmission by using a second set of antenna ports that is different from the first set of antenna ports. The operations of block 3625 may be performed in accordance with the procedures described with reference to Figures 1 through 11. In certain examples, aspects of the operations of block 3625 may be performed by a multiplexing component as described with reference to Figures 16 through 19, which may operate in cooperation with a receiver 1610 or 1710 as described with reference to Figures 16 or 17, or antenna(s) 1940 and transceiver(s) 1935 as described with reference to Figure 19.

It should be noted that the procedures described above describe possible implementations and that the operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects of two or more of the procedures may be combined.

The techniques described herein can be used for various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA) , orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and other systems. The terms "system" and "network" are often used interchangeably. A code division multiple access (CDMA) system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers the IS-2000, IS-95 and IS-856 standards. IS-2000 versions may be commonly referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. U ^t R ^a includes Wideband CDMA (WCDMA) and other variants of CDMA. A time division multiple access (TDMA) system may implement a radio technology such as Global System for Mobile Communications (GSM).

An Orthogonal Frequency Division Multiple Access (OFDMA) system may implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi ), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are versions of the Universal Mobile Telecommunications System (UMTS) that use E-UTRA. UTRA, E-UTRA, ^UmTS , LTE, LTE-A, NR, and the Global System for Mobile Communications ( ^gSM ) are described in documents from the organization called "3rd Generation Partnership Project" (3GPP ). CDMA2000 and UMB are described in documents from an organization called "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein can be used for the aforementioned radio technologies and systems, as well as other radio technologies and systems. While aspects of an LTE or NR system may be described for example purposes, and LTE or NR terminology may be used throughout much of the description, the techniques described herein apply beyond LTE applications. or NR.

In LTE/LTE-A networks, including the networks described herein, the term evolved node B (eNB) can be used generally to describe base stations. The wireless communications system(s) described herein may include a heterogeneous LTE/LTE-A or NR network in which different types of Evolved Node Bs (eNBs) provide coverage for various geographic regions. For example, each eNB, gNB, or base station may provide communication coverage for a macro cell, a small cell, or other cell types. The term "cell" can be used to describe a base station, a carrier, or a component carrier associated with a base station, or a coverage area ( e.g. , sector, etc.) of a carrier or base station, depending on of the context.

Base stations may include or may be referred to by those skilled in the art as a base transceiver station, radio base station, access point, radio transceiver, NodeB, eNodeB (eNB), next generation NodeB (gNB ), home NodeB, a home eNodeB, or some other suitable terminology. The geographic coverage area of a base station can be divided into sectors that constitute only a portion of the coverage area. The wireless communication system(s) described herein may include base stations of different types (eg, macro or small cell base stations). The UEs described herein may be capable of communicating with various types of base stations and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like. There may be overlapping geographic coverage areas for different technologies.

A macro cell generally covers a relatively large geographic area (eg, several kilometers in radius) and can allow unrestricted access by UEs with service subscriptions with the network provider. A small cell is a lower power base station, compared to a macro cell, that may operate in the same or different (eg licensed, unlicensed, etc.) frequency bands as macro cells. Small cells may include picocells, femtocells, and microcells according to various examples. A pico cell, for example, may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. A femto cell can also cover a small geographic area (for example , a home) and can provide restricted access by UEs that have an association with the femto cell (for example ^, UEs in a closed subscriber group (CSG), UEs for home users and the like). An eNB for a macro cell can be referred to as a macro eNB. An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB. An eNB may support one or multiple (eg two, three, four and the like) cells (eg component carriers).

The wireless communications system(s) described herein may support synchronous or asynchronous operation. For synchronous operation, base stations may have similar frame timing and transmissions from different base stations may be approximately time aligned. For asynchronous operation, base stations may have different frame timing and transmissions from different base stations may not be time aligned. The techniques described herein can be used for either synchronous or asynchronous operations.

The downlink transmissions described herein may also be called forward link transmissions, while the uplink transmissions may also be called reverse link transmissions. Each communication link described herein, including, for example, the wireless communications system 100 and 200 of Figures 1 and 2 may include one or more carriers, where each carrier may be a signal made up of multiple subcarriers. (for example, waveform signals of different frequencies).

The description set forth herein, in conjunction with the accompanying drawings, describes exemplary configurations and does not represent all examples that may be implemented or that fall within the scope of the claims. The term "illustrative" used herein means "serving as an example, instance or illustration" and not "preferred" or "advantageous over other examples". The detailed description includes specific details for the purpose of providing an understanding of the techniques being described. However, these techniques can be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the examples being described.

In the accompanying figures, similar components or features may have the same reference label. Additionally, multiple components of the same type can be distinguished by following the reference tag with a hyphen and a second tag that distinguishes between similar components. If only the first reference tag is used in the specification, the description applies to any of the similar components that have the same first reference tag, regardless of the second reference tag.

The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, Commands, information, signals, bits, symbols, and chips that may be referenced throughout the description above may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination of these. themselves.

The various illustrative blocks and modules described in connection with the disclosure herein may be implemented or realized with a general purpose processor, DSP, ASIC, FPGA, or other programmable logic device, discrete gate, or transistor logic. , discrete hardware components, or any combination thereof that are designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (eg, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors together with a DSP core, or any other such configuration).

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and the appended claims. For example, due to the nature of software, the functions described above may be implemented through the use of software that is executed by a processor, hardware, firmware, wiring, or combinations of any of these. Features that implement functions may also be physically located in various locations, including arranging such that portions of the functions are implemented in different physical locations. Also, as used herein, including in the claims, "or" as used in a list of elements (for example, a list of elements preceded by an expression such as "at least one of" or " one or more of') indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the term "based on" shall not be construed as referring to a closed set of conditions. For example, an illustrative step that is described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the term "based on" shall be interpreted in the same manner as the term "based at least in part on."

Computer readable medium includes both non-transient computer storage medium and communication medium including any medium that facilitates the transfer of a computer program from one location to another. A non-transient storage medium can be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transient computer-readable media may comprise RAM, ROM, electrically erasable programmable read-only memory (EEPROM), compact disk (CD) ROM, or other optical disk storage, magnetic disk or other magnetic storage devices, or any other non-transient media that can be used to carry or store desired program code media in the form of instructions or data structures and that can be accessed by a general-purpose or non-transient computer special, or a general purpose or special purpose processor. Also, any connection is appropriately referred to as a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave are included in the middle definition. Disk and disk, as used herein, includes CD, laser disk, optical disk, digital versatile disk (DVD), floppy disk, and Blu-ray disk where disks generally reproduce data magnetically, while that discs reproduce data optically with lasers. Combinations of the foregoing are also included within the scope of computer readable medium.

The description herein is provided to enable one of skill in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure, as defined by the appended claims.

Claims (15)

1. A method (2100) for wireless communication, comprising: identify (2105) a set of shortened transmission time intervals, sTTIs (615, 620, 625, 630, 635, 640), for the uplink transmissions of a first wireless service, the set of sTTIs (615, 620, 625, 630, 635, 640) is located within the subframe time limits of a subframe (600) of a second wireless service; identify (2110) two or more sTTIs (615, 640) within the set of sTTIs (615, 620, 625, 630, 635, 640) for the transmission of the sounding reference signal, SRS, transmissions within the subframe time limits; Y transmit (2125) one or more SRS transmissions in at least one of the two or more sTTIs (615, 640), the method further comprising identify (2115) a first subset (620, 625, 630, 635) of the sTTI set each spanning two orthogonal frequency division multiplexing, OFDM, symbols, and a second subset (615, 640) of the sTTI set each one spanning three OFDM symbols; Y configuring (2120) two or more sTTIs of the second subset (615, 640) for the one or more SRS transmissions, wherein identifying (2115) the second subset comprises: identifying a first three symbol sTTI (615) as an initial sTTI of a first slot within the time limits of the subframe; identifying a second three-symbol sTTI (640) as a final sTTI of a second slot within the time limits of the subframe; and identify a first SRS symbol (645-a) within the first three-symbol sTTI (615) for a first SRS transmission and a second SRS symbol (645-b) within the second three-symbol sTTI (640) for a second SRS transmission, wherein the second SRS symbol (645-b) of a first subframe (600) is adjacent to the first SRS symbol of a subsequent subframe. 2. The method (2100) of claim 1, wherein a number of the SRS transmissions within subframe time limits can be configured by a base station (105). 3. The method (2100) of claim 1, wherein identifying the second subset comprises: identifying a final sTTI (640) within each of a first slot and a second slot within the time limits of the subframe as the three-symbol sTTI. 4. The method (2100) of claim 1, further comprising: receiving (2405) an aperiodic configuration in an uplink grant indicating the resources for the one or more SRS transmissions in at least one of the two or more sTTIs, or the method further comprising: receiving (2505) a downlink grant indicating that an uplink control channel transmission is to be transmitted; Y determining (2510), based at least in part on the downlink grant, that the one or more SRS transmissions should be transmitted. 5. The method (2100) of claim 1, further comprising: receiving configuration information (2605) indicating resources for periodic SRS transmissions, or further comprising: identifying a first bandwidth for the one or more SRS transmissions based at least in part on one or more channel bandwidth or sTTI length for uplink transmissions, or further comprising: multiplexing (2715) a demodulation reference signal, DMRS, with a first SRS into a first symbol that is configured for transmission of both the DMRS and the SRS, wherein the multiplexing may comprise: transmitting the DMRS in a first interleaved of the first symbol; Y transmit the first SRS in a second interleave of the first symbol. 6. A method for wireless communication, comprising: identify a set of shortened transmission time intervals, sTTIs (615, 620, 625, 630, 635, 640), for the uplink transmissions of a first wireless service, the set of sTTIs that falls within the bounds of subframe time of a subframe (600) of a second wireless service; identifying two or more sTTIs (615, 640) within the set of sTTIs for transmitting the probing reference signal, SRS, transmissions within subframe time limits; Y configuring a user equipment, UE (105), to transmit one or more SRS transmissions using at least one of the two or more sTTIs (615, 640), the method further comprising configuring a first subset of the set of sTTI (620, 625, 630, 635) each spanning two OFDM symbols, and a second subset of the set of sTTI (615, 640) each spanning three OFDM symbols; Y configuring two or more sTTIs of the second subset (615, 640) for the one or more SRS transmissions, wherein configuring the second subset comprises: configuring a first three-symbol sTTI (615) as an initial sTTI of a first slot within subframe time limits; configuring a second three-symbol sTTI as an ending sTTI (640) of a second slot within the time limits of the subframe; Y configure a first SRS symbol (645-a) within the first three-symbol sTTI for a first SRS transmission and a second SRS symbol (645-b) within the second three-symbol sTTI for a second SRS transmission , wherein the second SRS symbol of a first subframe is adjacent to the first SRS symbol of a subsequent subframe. 7. The method of claim 6, further comprising: identifying a subset (620, 625, 630, 635) of the sTTI set each spanning two orthogonal frequency division multiplexing, OFDM, symbols; Y configure two or more subset sTTIs for one or more SRS transmissions. 8. The method of claim 6, further comprising: transmitting an aperiodic configuration in an uplink grant to the UE (105) indicating the resources for the one or more SRS transmissions. transmit a downlink grant to the UE (105) indicating that an uplink control channel transmission should be transmitted and that the one or more SRS transmissions should be transmitted, or transmit configuration information indicating resources for periodic SRS transmissions, wherein the configuration information may comprise an indication of cell-specific sTTIs and UE-specific sTTIs (105) to be used for SRS transmissions; SRS, and wherein the method may further comprise: identifying a first sTTI for SRS transmission when the first sTTI corresponds to both a cell-specific sTTI and a UE-specific sTTI. 9. The method of claim 6, further comprising: identifying a first bandwidth for a first SRS transmission of the one or more SRS transmissions based at least in part on one or more of a channel bandwidth or sTTI length for the uplink transmissions. 10. The method of claim 6, further comprising: configuring the UE to multiplex a demodulation reference signal, DMRS, with a first SRS transmission in a first symbol. 11. An apparatus (1400) for wireless communication, comprising: means for identifying (1420) a set of shortened transmission time intervals, sTTI, for uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time boundaries of a subframe of a second wireless service; means for identifying (1425) two or more sTTIs within the set of sTTIs for transmitting the probing reference signal, SRS, transmissions within subframe time limits; and means for transmitting one or more SRS transmissions in at least one of the two or more sTTIs, the apparatus further comprising: means for identifying (1420) a first subset of the sTTI set each spanning two orthogonal frequency division multiplexing, OFDM, symbols, and a second subset of the sTTI set each spanning three OFDM symbols; Y means for configuring (1445) two or more sTTIs of the second subset for the one or more SRS transmissions, wherein identifying the second subset comprises: identifying a first three-symbol sTTI as an initial sTTI of a first slot within the time limits of the subframe; identifying a second three-symbol sTTI as a final sTTI of a second slot within the time limits of the subframe; and identify a first SRS symbol within the first three-symbol sTTI for a first SRS transmission and a second SRS symbol within the second three-symbol sTTI for a second SRS transmission, wherein the second SRS symbol of a first subframe is adjacent to the first SRS symbol of a subsequent subframe. 12. The apparatus (1400) of claim 11, further comprising: means for receiving an aperiodic configuration in an uplink grant indicating the resources for the one or more SRS transmissions in at least one of the two or more sTTIs, or means for multiplexing (1450) a demodulation reference signal, DMRS, with a first SRS into a first symbol that is configured for transmission of both the DMRS and the SRS. 13. An apparatus (1800) for wireless communication, comprising: means for identifying (1820) a set of shortened transmission time intervals, sTTI, for uplink transmissions of a first wireless service, the set of sTTIs that falls within the subframe time boundaries of a subframe of a second wireless service; means for identifying (1825) two or more sTTIs within the set of sTTIs for transmitting the probing reference signal, SRS, transmissions within subframe time limits; and means for configuring (1830) a user equipment, UE, to transmit one or more SRS transmissions in at least one of the two or more sTTIs, the apparatus (1800) further comprising: means for configuring a first subset of the sTTI set each spanning two orthogonal frequency division multiplexing, OFDM, symbols and a second subset of the sTTI set each spanning three OFDM symbols; Y means for configuring two or more sTTIs of the second subset for the one or more SRS transmissions, wherein configuring the second subset comprises: configuring a first sTTI of three symbols as an initial sTTI of a first slot within the time limits of the subframe; configuring a second sTTI of three symbols as a final sTTI of a second slot within the time limits of the subframe; Y configure a first SRS symbol within the first three-symbol sTTI for a first SRS transmission and a second SRS symbol within the second three-symbol sTTI for a second SRS transmission, wherein the second SRS symbol of a first subframe is adjacent to the first SRS symbol of a subsequent subframe. 14. The apparatus (1800) of claim 13, further comprising: means for transmitting an aperiodic pattern in an uplink grant to the UE indicating the resources for the one or more SRS transmissions. means for transmitting a downlink grant to the UE indicating that an uplink control channel transmission is to be transmitted and that the one or more SRS transmissions are to be transmitted. 15. The computer program comprising instructions that, when carried out by at least one processor, causes the at least one processor to perform the method according to any one of claims 1 to 5 or the method according to any one of claims 6 to 10